there, but for my family, I'd end up.
Okay, I had to do some research due to an argument once, a long time ago, in an anthropology class, about the age of menarche. (the proposition I was arguing was that menarche traditionally started between 18 and 20 up until the post Victorian era. There was a LOT of cultural baggage involved in that proposition, but it was fun to pull up the records, papers, and demographics).
This, somehow, led me to really looking into life expectancy - and to a grain free lifestyle- 93 is a lot, and but not completely unheard of in a 'pre cereal agriculture' setting. Adult life expectancy actually dropped with the adoption of cereal agriculture almost everywhere.
From a strict survival poitn of view, if you make to age 15 with a hunting and foraging type of diet and active lifestyle, you can expect to get into your 60s without much trouble without medical care. With the basics- treatment of life threatening injuries and prevention of infections, you can do pretty well.