As a graduate in health economics, I'd use the QALY threshold to answer this question. A QALY is a quality adjusted life year i.e., a year in perfect health-related quality of life, two years with 50% quality and so on (multiplicatory approach, not much more explanation needed, I hope).

From there on, we could take the example of the UK, which is usually the reference for other systems. The UK government sets £20,000 per QALY gained i.e., a medicine or health technology is reimbursed if its cost divided by additional QALYs (improved health state, longer life expectancy or a combination of both) is less than this threshold. From there on, you could calculate the life expectancy and the average health-related quality of life and obtain a "cost per life".

This is what happens with life saving medicines for newborns, where the government is willing to pay sums surpassing a million pounds.
You could look up what the estimated values of cost per QALY and life expectancy and expected life quality in your country and find the estimated value for your own life.