[SamAdams76]

I’m thinking that if all of us were thrown back in time to say 1821, before there were all these medicines and modern conveniences, half of us would be dead within a year.

[Mogger]

I’m thinking that if all of us were thrown back in time to say 1821, before there were all these medicines and modern conveniences, half of us would be dead within a year.

Exactly. Doing genealogy research, the weak and the unlucky died very young, dragging the "average" life span down, and the tough and lucky lived to very old ages.

[Daffynition]