How does our doddering in our eighties interfere with our progeny's progeny? I mean, do they need our money for college or something?
As long as we can care for ourselves, there is enough space for all of us. And my grandchildren adore me. And I will give them my money so they won't be sitting around wishing me gone.
A natural life span if everything works is about 100. Granted my great grandmother lived to be 101 (1845-1947), and decided to die, and did, on a dime, when her favorite eldest son died at 79, with her having no apparent health problems per se. She was sentient and ambulatory and active until her final exit. Or so my grandmother told me (grandmother was the youngest of the six who survived to adulthood).