I had a thought this morning, as a lay there too idle to get up. So just now I googled to get my facts straight. We represent the 300,000th generation of humans (OK, I do. My kids are 300,001st; their kids are the 300,002nd.) But until only about seven generations ago almost everyone died before they were fifty, and many died in their thirties. Go back further and few survived beyond their twenties. So aren't we incredibly lucky? We had a one in 43,000 chance of being humans who can expect a long lifespan.
Bill