Your dad tells you the same story twice during one phone call.
You both laugh. “I’m getting old,” he says.
But after you hang up, the question stays with you:
Was that ordinary forgetfulness—or could it be dementia?
It is easy to jump to the worst conclusion. It is also easy to explain every change away as age.
The truth sits somewhere in the middle.
Our brains change as we get older. Names may take longer to arrive. New technology may feel less friendly. We may enter a room and forget what brought us there.
Dementia is different. It creates a decline that becomes noticeable, happens repeatedly and begins to interfere with everyday life.
The NHS estimates that 1 in 11 people over 65 in the UK has dementia. But dementia is not an inevitable part of getting older.
So, what should you look for?
The simplest difference: inconvenience or interference?
Imagine your brain as a busy kitchen.
With normal ageing, finding the right ingredient may take a little longer. You open two cupboards before remembering where the cinnamon lives.
With possible dementia, the familiar recipe itself may become difficult to follow. Steps get missed. Ingredients appear in unusual places. A meal made hundreds of times suddenly feels unfamiliar.
That is the key distinction:
- Normal ageing may occasionally slow someone down.
- Possible dementia repeatedly disrupts familiar tasks, decisions or conversations.
One forgotten name does not diagnose anything. Neither does one missed appointment.
Look for a pattern that is new, persistent and gradually affecting daily life.
1. Memory and recent information
Memory changes are often what families notice first.
More typical of normal ageing
Someone might:
- Forget the name of a person they do not know well
- Misplace their glasses but retrace their steps and find them
- Miss an occasional appointment
- Forget why they entered a room
- Need a reminder about something discussed days ago
- Remember the missing information later
The memory may feel slower, like an internet page taking longer to load. The information is usually still there.
More concerning
Someone might:
- Forget a conversation that happened a few minutes ago
- Ask the same question repeatedly without remembering the answer
- Depend heavily on others for information they previously managed
- Place everyday objects somewhere very unusual
- Forget important appointments again and again
- Lose track of whether medication has been taken
- Struggle to learn a simple new routine
The difference is not just forgetting. It is the frequency, the change from the person’s usual ability and the effect on their life.
The Alzheimer’s Society offers detailed examples comparing possible dementia symptoms with common signs of ageing.
2. Planning, concentration and decision-making
Dementia is not only about memory. It can affect the mental steps needed to plan, organise and solve problems.
More typical of normal ageing
Someone might:
- Take longer to understand a new process
- Make an occasional mistake with a bill
- Find online banking confusing after an update
- Need written instructions for unfamiliar technology
- Become tired more quickly during a complicated task
They may work more slowly, but they can usually finish the task.
More concerning
Someone might:
- Struggle to follow a familiar recipe
- Become confused when paying regular household bills
- Make repeated financial mistakes
- Find it difficult to plan a simple journey
- Lose track of steps when making tea or preparing a meal
- Become unusually vulnerable to scams
- Make decisions that create clear and repeated risks
Think of it as losing the thread rather than simply needing more time.
3. Language and conversation
Everyone occasionally has a word sitting stubbornly on the tip of their tongue.
That alone is not unusual.
More typical of normal ageing
Someone might:
- Temporarily forget a word but remember it later
- Lose the thread of a conversation when several people are talking
- Need more time to explain something
- Occasionally use the wrong word and immediately correct it
More concerning
Someone might:
- Regularly stop because familiar words will not come
- Refer to common objects as “that thing”
- Use words that do not fit the sentence
- Struggle to follow a calm, one-to-one conversation
- Repeat the same point without noticing
- Withdraw from conversations because speaking has become difficult
A helpful question is: Has conversation become noticeably harder than it used to be?
4. Time, place and familiar surroundings
Most of us occasionally check what day it is.
The concern grows when someone becomes confused in a place or routine they know well.
More typical of normal ageing
Someone might:
- Briefly confuse Tuesday with Wednesday
- Feel lost in a completely unfamiliar area
- Forget the date but work it out using a calendar
- Take a wrong turn and quickly correct it
More concerning
Someone might:
- Get lost on a familiar journey
- Become confused inside a regularly visited shop
- Lose track of the month, season or year
- Be unsure why they are in a particular place
- Leave home and struggle to find the way back
- Confuse events from long ago with what is happening now
A single wrong turn may be a mistake. Repeatedly becoming lost in familiar surroundings needs attention.
5. Vision and understanding what is being seen
This sign surprises many families.
Some types of dementia can affect how the brain interprets visual information—even when the eyes are receiving it.
Someone may:
- Struggle to judge distances on stairs
- Misinterpret reflections
- Mistake a pattern on the floor for an obstacle
- Reach inaccurately for an object
- Find parking or positioning the car increasingly difficult
- Fail to recognise a familiar object or, sometimes, a familiar face
Changes in eyesight can also cause similar difficulties. Cataracts, poor lighting or an outdated glasses prescription may be responsible.
That is why assessment matters. You cannot reliably identify the cause by watching from the sidelines.
6. Mood, behaviour and personality
Not every early sign looks like forgetfulness.
More typical of normal ageing
Someone may become annoyed when a routine changes or feel less enthusiastic about a tiring social event.
Their response still feels recognisable and proportionate.
More concerning
You might notice:
- Withdrawal from hobbies, friends or family
- Unusual anxiety or fearfulness
- Growing suspicion of familiar people
- Loss of motivation
- Behaviour that seems out of character
- Reduced awareness of other people’s feelings
- Increased impulsiveness or poor judgement
- Difficulty coping in familiar situations
These changes can also be caused by depression, grief, pain, medication or other health problems. Do not assume the cause—but do not ignore a lasting change either.
Memory loss is not always the first sign
The word “dementia” often makes us picture memory loss. But dementia is an umbrella term, not one single disease.
Different diseases can affect different parts of the brain.
Some people first experience:
- Slower thinking and difficulty planning
- Changes in language
- Problems judging distance or interpreting objects
- Changes in behaviour or personality
- Movement difficulties
- Hallucinations
This is particularly important when symptoms begin before 65. Younger people may still develop dementia, and their early symptoms may not fit the familiar picture of an older person becoming forgetful.
Do not dismiss a persistent change simply because someone is “too young” or still remembers names and dates.
Try the five-question pattern check
When you are uncertain, ask five questions:
1. Is it new?
Has this always been part of the person’s personality or way of doing things?
A lifelong dislike of paperwork is different from suddenly being unable to manage familiar bills.
2. Is it happening repeatedly?
One burnt meal may be distraction. Several burnt pans and a cooker repeatedly left on form a pattern.
3. Is it becoming worse?
Dementia symptoms usually develop gradually and worsen over time.
A simple diary can help you see whether incidents are isolated or increasing.
4. Is it affecting everyday life?
Can the person still shop, cook, take medication, communicate, travel and manage money as safely as before?
Daily impact often tells you more than the forgotten detail itself.
5. Have other people noticed?
Family, friends, neighbours or colleagues may each hold one piece of the puzzle.
One person notices repeated questions. Another notices missed appointments. Together, those observations may reveal a change that no single person could see.
It might be something treatable
Memory or thinking problems do not automatically mean dementia.
The NHS lists other possible causes, including:
- Stress
- Anxiety or depression
- Poor sleep
- Sudden confusion caused by an illness or infection
- An underactive thyroid
- Side effects from medication
Hearing or vision problems can also make someone appear confused or withdrawn because they are missing parts of conversations or struggling to interpret their surroundings.
This is one reason not to diagnose someone over the kitchen table.
A medical assessment is not simply a search for dementia. It is also a search for other explanations that may need treatment.
The NHS advises seeing a GP when memory problems keep happening or affect everyday life.
What about mild cognitive impairment?
Sometimes a person has noticeable problems with memory or thinking but can still manage most everyday activities independently.
A healthcare professional may describe this as mild cognitive impairment, or MCI.
MCI is not the same as dementia. Its symptoms are milder, and it can have several causes. Some people with MCI later develop dementia, while others remain stable or improve when an underlying problem is addressed.
The Alzheimer’s Society provides a clear explanation of mild cognitive impairment and how it differs from dementia.
It still deserves proper assessment. “Not dementia” does not mean “nothing worth checking.”
How to raise the subject without frightening someone
Opening with “I think you have dementia” can make the conversation feel like a verdict.
Start with what you have noticed.
Try:
- “I’ve noticed the bills have felt more difficult lately. How are you finding them?”
- “You seemed worried when you could not find your way home. Shall we talk to the GP?”
- “You’ve mentioned your memory a few times. Would you like us to get it checked?”
- “There are several things that can affect memory. It might be useful to rule them out.”
- “Would you like me to come to the appointment with you?”
Choose a calm, familiar place. Allow time. Listen rather than building a case against them.
Avoid secretly testing their memory or turning every mistake into evidence.
The goal is not to catch someone out. It is to help them understand what is changing and access support.
The NHS offers further guidance on talking to someone when you are worried about possible dementia.
Prepare useful information for the GP
Before the appointment, write down specific examples.
“Her memory is bad” gives the GP very little to work with.
Instead, record:
- What happened
- When it happened
- Whether it has happened before
- How it affected daily life or safety
- Any change in mood, sleep, appetite or movement
- Recent illnesses or infections
- Current medicines and any recent changes
- Whether other people have noticed similar concerns
Bring glasses and hearing aids if they are normally used. Take an up-to-date medication list.
If the person agrees, someone who knows them well can attend. They may remember examples or help explain how abilities have changed.
What happens during a dementia assessment?
A GP will usually ask about the symptoms, when they began and how they affect everyday activities such as cooking, shopping, dressing and paying bills.
They may also:
- Review medicines
- Ask about mood, sleep and physical health
- Carry out a physical examination
- Arrange blood or urine tests
- Use a short memory or thinking assessment
- Refer the person to a memory clinic or specialist
- Arrange a brain scan when appropriate
No single short memory test can tell the whole story.
The assessment brings several pieces together: the person’s history, daily functioning, medical information, test results and changes noticed over time. The NHS explains the process in its guide to getting a dementia diagnosis.
Sudden confusion is different—and urgent
Dementia usually develops gradually.
If someone becomes confused suddenly—over hours or a day—do not assume their dementia has simply worsened.
Sudden confusion may be caused by an infection, stroke, low blood sugar, head injury, medication or another urgent medical problem.
The NHS advises going to A&E or calling 999 when someone suddenly becomes confused.
Stay with the person, speak calmly and gather their medication information while waiting for help.
So, is it dementia or normal ageing?
You may not be able to answer that question yourself—and you do not need to.
Focus on the pattern:
- Is the change new?
- Does it keep happening?
- Is it getting worse?
- Is it affecting familiar tasks?
- Is it creating distress or risk?
Normal ageing may make the brain take the scenic route.
Dementia begins to change the map.
Noticing the difference is not about labelling someone. It is about opening the door to assessment, answers and support.
Approach the conversation with kindness. Write down specific examples. Encourage a GP appointment. Treat sudden confusion as urgent.
Most importantly, remember that a diagnosis does not erase the person.
They remain themselves—with preferences, relationships, strengths and a right to be involved in decisions about their life.
If you are worried about whether someone can continue living independently, read Part 1 of the series: Can Someone With Dementia Safely Live Alone?
This article provides general dementia information and is not a substitute for an individual medical assessment. Contact a GP if memory or thinking problems persist or affect daily life. Call 999 or go to A&E if someone suddenly becomes confused.
