Unfortunately ageing doesn't tend to be 'some years tacked on the end', it tends to be literally getting older at a different rate. So some 40 year-olds are ph

Unfortunately ageing doesn't tend to be 'some years tacked on the end', it tends to be literally getting older at a different rate. So some 40 year-olds are physically 30, and other 40 year-olds are physically 55. (going by length of telomeres, physical fitness, etc etc). So these people that die earlier have a shorted 'prime of their life' as well.