It's all about genes, luck, and lifestyle. You can't change the first, and you can influence the second only partially, but you have full control over the third.
My still-going-strong 94-year-old mother-in-law reminds her kids that she gave them good genes (spelled Jeanne -- her name)
.
There are several nonagenarians and a couple of almost-nonagenarians in my family tree, as well, so my wife and I are budgeting our money for age 100+. However, I am far more concerned about quality of life than quantity.
__________________
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069