This isn’t unusual for the times. I believe the same analysis was done in the Anasazi region of skeletons and they found the same thing. Puberty was their middle age, and 30 was old.
Not buying it.
Caesar was 55 when he died. But he was murdered (et tu, Brute? yada yada).
The human lifespan is genetically determined (until we fix it). The best modern medicine can do is to prevent early exit.