The aim is more healthy years, not simply more years of life

The argument

Proponents are usually careful to state what the research is for. The objective is not to extend the period of decline but to postpone it, so that the years of frailty, dependence and multiple illness that now precede death occupy a smaller part of a longer life. They argue that most of what people fear about old age is this stretch rather than death itself, and that most of what it costs falls in the same place, in nursing care, hospital admissions and the labour of relatives who give up work to provide it. On this account the economics are the reverse of what critics assume. The expense of an ageing population arises from years lived in poor health, so an intervention that kept people well for longer would reduce the period of dependency even if it extended life, and a treatment that delayed the onset of several conditions would displace a great deal of care spending. Proponents argue that this is why the research should be treated as a matter of health policy and not a pursuit of longevity for its own sake, and why the measure of success is years lived in good health rather than years lived. They add that the pressure is immediate. The proportion of people in later life is rising while the proportion of working age is not, so the number needing care is growing faster than the number able to provide or fund it, and that gap widens on current trends whatever is done about pensions. Proponents argue that improving treatment for each condition separately cannot close it, since a population kept alive with more illnesses needs more care rather than less, and that the only approach which addresses the cause of the pressure is one that keeps people healthy for longer.

Premises

Counter-arguments

Critics argue that the compression of frailty is an assumption rather than a finding, and that an intervention which slowed decline unevenly could easily produce more years of dependence rather than fewer, which is the outcome the argument assumes away. They note that past gains in life expectancy added years of illness as well as years of health, so the precedent does not support the optimistic reading. On the economics they argue that longer lives bring their own costs in pensions, housing and care regardless of health status, and that treating research as a way to relieve fiscal pressure makes a very long bet carry a problem that could be addressed now through better social care, prevention and the organisation of work.

Rejecting the premises

[Rejecting P1] Postponing decline is the stated aim rather than a demonstrated result, and an intervention that slowed some aspects of ageing and not others would add dependent years instead. [Rejecting P2] Past gains in life expectancy added years of illness as well as years of health, so the precedent does not support the assumption that frailty compresses. [Rejecting P3] Longer lives bring costs in pensions, housing and care regardless of health status, and demographic pressure can be addressed now through social care, prevention and the organisation of work. [Rejecting C] Treating a long and uncertain research programme as the answer to a present fiscal problem makes the bet carry a burden it cannot bear.