According to this if you made it to 15 your average life expectancy was around 54.
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.
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.