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HungryHobo comments on Why people want to die - Less Wrong Discussion
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According to this if you made it to 15 your average life expectancy was around 54.
http://www.unm.edu/~hkaplan/KaplanHillLancasterHurtado_2000_LHEvolution.pdf
Epidemics and parasite load may have been lower than you might think if the populations were more diffuse. Things spread better through a dense population jammed into a refugee camp than through a sparse population.
OK, let's accept that 54 years number. A US 15-year-old male has the life expectancy of 15+62=77 years and a 15-year-old female -- 15+67=82 years (source). Take the average of 80, more or less.
So basically the life expectancy of a contemporary American 15-year-old is one and a half times larger than the life expectancy of a 15-year-old from a forager tribe. That's not "about as old". Besides, hunter-gatherers are known to be healthier than farmers.