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