Here is a thought experiment. Assume that every hour you run you extend your life by an hour.
I have chosen a one-to-one ratio between the increase in longevity from running and the time running because higher ratios lead to the immortality paradox. Lazarus aside, the all-cause mortality for Homo sapiens is 100 % and will remain so for the foreseeable future.
This arithmetic means that at one point you will literally be running for your life: your life being extended precisely by the time spent running. But ignore this logical fallacy.
You run an hour every day for 40 years. Your life is extended by 1.67 years. Your costs are a new pair of running shoes every three months, which might even be covered at zero co-payment by insurance if USPSTF gave running a grade A or B recommendation.
A back of the envelope calculation, assuming the shoes cost $ 80, yields cost per life year of roughly $7664. There is, of course, more nuance. I am not including injuries that may result from running. I am not discounting time: I am assuming we value an hour now the same as an hour 40 years from now.
I am also not factoring the costs avoided of treating late stage cardiovascular disease, which must be balanced against the additional social security checks that the individual will draw because of living longer, not to mention the costs of treating diseases of extended longevity such as cognitive impairment, Alzheimer’s disease, recurrent falls.
But please continue to indulge my approximation. The point is not precision of economic calculations but a principle.
$7664 for an additional life year. Compared to the benchmark of $50, 000 per quality-adjusted life year that’s a bargain!
Was it worth it then?