I've wanted to ask this question for a while - is most of LDW under 40? That might explain why, with Level 3 medicine, villagers start crawling at the early age of 66 . Doesn't say much for your Presidents who were 66+

They are not crawling, just going a little slower.

With the right diet and exercise (and medicine tech), the slowdown can happen at a later and later age for the villagers.

Arthur, you didn't answer the question