And really, congratulations to them and to you for that genetic legacy. On the other hand, I don't know of a male relative on my father's side that made it to 70. Dad dropped within 5 years of early retirement. And watching the agonizing, emasculating way that death took him told me (a) don't wait until too late to retire, and (b) don't fight for that last extra year if it's going to be the most painful, unproductive year of your life.
I've had a great life, but I'm only going to keep clinging to it while it's a life worth living. Could be 65, could be 85, but there will be a point when the advantages of keeping this body moving through the days do not outweigh the disadvantages.