Call me a heretic, but a 10-15 years discrepancy at a baseline of 70+ years life expectancy does not sound that scary or problematic to me.
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.