Healthspan and lifespan: what is the difference?

The word healthspan often means years in good health, but there is no single universal definition. WHO’s healthy life expectancy is a population measure that adjusts expected years of life for the severity of ill health experienced across the lifespan.

The difference between life expectancy and healthy life expectancy represents equivalent years of full health lost across a population’s lifetime. It does not mean that everyone spends a fixed final decade ill. People can also maintain fulfilling lives, independence and meaningful activities with a chronic condition or disability.

The opposite outcome is also possible. If medicine keeps people alive longer without delaying the onset of disease, the years of illness expand. The balance between the two varies by country, by condition and by social group.

Fries's idea is the reason healthspan became a term in its own right, and it gave public health a target that people can move with ordinary habits. Delaying the start of heart disease, type 2 diabetes, frailty and dementia by even a few years changes the shape of a life more than adding those same years at the end.

Diet belongs on the list as well, and it runs through several of the others. A plate built on vegetables, whole grains, legumes and fish, with less processed meat and less sugar, is the common thread in the eating patterns of populations that age well. No single food, pill or device is on the list.

Healthy life expectancy is lower than total life expectancy because it accounts for ill health across life. Comparisons require the same year and method. Subtracting unrelated national and WHO estimates does not establish how many final years the average resident will spend disabled.

Healthier SG supports prevention and ongoing care through an enrolled family doctor and a health plan. Activity programmes, active ageing centres and community connections can also support wellbeing. These services can contribute to both healthy years and life expectancy.

In Singapore, cooler morning and evening hours can make outdoor activity easier. Hawker meals can fit a balanced diet with attention to vegetables, protein, rice portions and salt. Healthier SG Screening helps eligible adults check cardiovascular risk, while an ongoing relationship with a doctor helps turn results into appropriate care.

The established group is the list in section 03, which has decades of evidence behind it and costs little or nothing.

The promising group is a set of legitimate research areas not yet proven in people at the level of a recommendation. These include the study of cellular ageing, various measures of "biological age", and some medicines that researchers are trialling for their effect on ageing itself. The consumer products that borrow its language tend to run well ahead of it.

The marketing group is anything that promises to add years, reverse ageing, or reset a biological clock, above all when the company that sells it also measures the result. A product that claims to lengthen healthspan should be able to point to a trial in people showing fewer years of illness, and almost none can.

A quick test helps. If a claim would still be true after removing the product, it is describing the habits, and the habits were free. The reasonable response to a label that borrows research language is to ask what the study measured, and in whom.

The evidence is consistent and unexciting. Not smoking, moving most days, keeping blood pressure, blood sugar and weight in range, sleeping enough and staying connected to other people account for most of what you can control. None of these needs a subscription.

If you are due for cardiovascular risk screening, check Healthier SG Screening eligibility with your clinic. Keep prescribed treatment and follow-up in place. A product marketed for longevity should not replace evidence-based care.