How Well Are You Really Ageing?

We measure ageing with birthdays.

56.
67.
74.
82.

But those numbers tell us surprisingly little about what someone can actually do.

Two people can both be 70. One may walk quickly, climb stairs, carry shopping, remember appointments, hear conversations clearly and live independently. The other may already be struggling with several of those things.

Same chronological age. Very different capacity.

The World Health Organization (WHO) uses the term intrinsic capacity for the collection of physical and mental capacities a person can draw upon in everyday life. It is not a single score or a promise about how long you will live. It is a useful way to ask a more practical question: how much ability do you have available for the life you want to lead?

This is very close to the idea behind Age Watchers. Rather than simply asking how old you are, we are interested in how well you are ageing — and what you may be able to do about it.

Your age isn't the whole story

Chronological age is simply how many years you have lived. It moves forward at the same rate for everyone.

Healthspan is a broader idea: the period of life spent in good health and able to function well. It is not identical to lifespan, and it is not a guarantee that life will be free from illness.

Intrinsic capacity means the physical and mental capacities available to you — your ability to move, think, see, hear, remember, respond emotionally and sustain the energy needed for daily life.

These are different concepts. They should not be treated as interchangeable medical measurements. In particular, intrinsic capacity is not an exact biological-age calculation, and neither Age Watchers nor this article can tell you your precise biological age or life expectancy.

What is intrinsic capacity?

WHO describes intrinsic capacity as a composite of the mental and physical capacities a person can draw on. WHO's ICOPE approach commonly discusses five areas: locomotion, cognition, psychological capacity, sensory capacity and vitality. For everyday understanding, it is helpful to open sensory capacity into its two familiar parts — vision and hearing — giving us six segments:

1. Locomotion

Locomotion is how effectively you move through the world. Strength, balance, walking ability, endurance and general physical function all contribute. It is not only about sport. It includes getting out of a chair, walking to the shops, climbing stairs and recovering when you trip or change direction.

2. Cognition

Cognition covers capabilities such as memory, attention, orientation, problem solving and executive function. In ordinary life, that can mean following a conversation, remembering an appointment, planning a journey or adapting when a familiar task changes.

3. Psychological wellbeing

This segment is about the psychological side of functioning, including mood, motivation and resilience. Psychological wellbeing can influence whether we engage with people, move our bodies, look after ourselves and continue with activities that matter to us. It is not a judgement about personality, and it should never be reduced to a single “good” or “bad” day.

4. Vision

Vision is the ability to see sufficiently well to function and navigate everyday life. Changes in sight can affect confidence, reading, mobility and independence. New or worsening visual symptoms deserve appropriate professional advice rather than a self-test.

5. Hearing

Hearing supports communication and connection. Being able to hear a conversation, notice important sounds and take part in social life can make a meaningful difference to day-to-day function. Suspected hearing loss is worth discussing with a qualified professional.

6. Vitality

Vitality refers to underlying physiological reserves associated with energy and metabolism. It is the capacity that helps you sustain activity, recover and meet the demands of daily life. It is influenced by many things, including nutrition, illness, sleep and physical activity, so it should not be confused with a simple energy rating.

Some WHO material and earlier research groups vision and hearing together as sensory capacity, producing five domains rather than six. That is not a different theory: it is the same overall concept described at a slightly different level of detail. The six-part card below is an Age Watchers teaching aid, not a validated diagnostic test or a clinical score.

Why this matters

Conventional healthcare measurements remain important. Blood pressure, cholesterol, blood glucose, body composition and medical diagnoses can identify risk, guide treatment and help clinicians make good decisions. Intrinsic capacity does not replace any of them.

It adds another question: what are you actually able to do?

That question matters because independence is lived, not just recorded. You may be able to have a normal-looking number on a report and still notice that carrying shopping, walking uphill or keeping your balance has become harder. Conversely, a diagnosis does not describe everything you can do or everything you may still be able to improve.

Without turning this into a formal self-diagnostic checklist, it is worth noticing whether you can:

• rise comfortably from a chair;
• carry shopping or a bag safely;
• climb the stairs you normally use;
• walk at a pace that works for your daily life;
• maintain your balance when standing or changing direction;
• follow a conversation in an ordinary setting;
• remember and organise everyday tasks; and
• continue doing activities that matter to you.

It's the direction that matters

One isolated measurement rarely tells the whole story. A reading can vary with sleep, stress, illness, equipment and the circumstances of the day. Repeating a sensible measure in a consistent way can make the direction easier to see.

For example, a pattern such as falling grip strength, slower walking, poorer balance, a rising resting heart rate or an increasing waist circumference may justify looking more closely at what is changing. Those are clues for a conversation and a plan — not a diagnosis made from a list.

Equally, increasing strength, better balance, improved walking capacity, improving blood pressure or a reducing waist circumference can show useful progress even while your chronological age continues to increase. The point is not to chase a perfect number. It is to notice a meaningful trend and respond appropriately.

Every measure has limitations. Persistent or unexplained deterioration in strength, mobility, cognition, mood, hearing, vision or general health should be discussed with an appropriate healthcare professional.

This is where Age Watchers gets interesting

We cannot stop the birthday clock. But some of the things that influence how well we function can be measured, monitored and, in many cases, worked on.

MEASURE — establish useful baselines.

UNDERSTAND — put those measurements into context.

IMPROVE — work on areas where change is realistic and appropriate.

MAINTAIN — keep the gains and continue monitoring the trajectory.

That is why the Age Watchers Framework exists. It is a way of moving from vague worry to a practical cycle: find a starting point, understand what it may mean, choose a manageable action and check whether the change lasts.

It is not a promise that every measure will improve, and it is not a substitute for clinical care. It is a structure for paying attention to the parts of ageing that are meaningful, observable and sometimes changeable.

What can we actually measure?

In the current Age Watchers app, your baseline and monthly check-ins can include weight, waist measurement, resting heart rate, blood pressure and optional VO₂ max, alongside weekly strength and cardiovascular sessions, daily steps, sleep, alcohol-free days and an energy/mood rating. These measures can help create context around your habits and progress over time.

Other measures are relevant to the wider intrinsic-capacity conversation but are not currently fields in Age Watchers. Examples include grip strength, a chair-stand or sit-to-stand test, formal balance testing, direct walking-speed measurement, and structured vision, hearing or cognitive assessments. Where these are appropriate, they may be discussed with a clinician or recorded using a suitable validated method — they should not be improvised as a diagnosis.

If you are an Age Watchers member, you can use the member measurement area to establish your supported baseline and return to monthly check-ins to review the direction of travel. You do not need to measure everything, and daily fluctuations are not a verdict on your health.

The goal isn't to be younger

Healthy ageing is not necessarily about trying to turn a 60-year-old into a 40-year-old. It is about protecting the capacity to live the life you want.

That might mean walking somewhere because you want to, travelling, gardening, playing with grandchildren, carrying your own shopping, getting up from the floor, living independently, continuing a hobby or remaining socially connected. The best measure is often the one that helps you keep doing something you value.

Ageing is inevitable. Losing every part of our capacity at the same rate isn't.

That sentence is editorial commentary, not a medical claim. It is a reminder that capacity is made up of several parts, and that a change in one area does not define the whole person.

A different longevity question

Your birthday will continue moving in one direction. That does not mean every measure of your physical and mental capacity has to follow exactly the same trajectory.

The emerging science around intrinsic capacity gives us another way of thinking about longevity. Not simply, “How long will I live?” but: “How much capacity can I maintain while I'm living?”

Start where you are. Notice what matters. Then:

Measure.
Understand.
Improve.
Maintain.

Sources / Further reading

• World Health Organization: Healthy ageing and functional ability (WHO Questions and answers, 2020).
• World Health Organization: Integrated care for older people (ICOPE): guidance for person-centred assessment and pathways in primary care, 2nd edition (2024).
• World Health Organization Clinical Consortium on Healthy Ageing: Topic focus — frailty and intrinsic capacity (2017).
• Cesari et al.: Evidence for the domains supporting the construct of intrinsic capacity, Journal of Gerontology: Series A (2018).
• Locquet et al.: Exploring the conceptual framework and measurement model of intrinsic capacity, peer-reviewed scoping review (2022).