It's in the genes, if you don't smoke or have a fatal accident you will probably have a long life as well.
My mom was born in 1911 and died at 97, her mom died at 95, her mom at 92, and her mom at 102. All of them except my mom raised large families and outlived their husbands by quite a few years. Unfortunately for me my dad's family didn't have good genes to pass on to their male descendants.
If they didn't have good genes to pass on you wouldn't be here to post this. If longevity is valued above other qualities and traits with a genetic component, sire children later in life and keep doing it across generations.
And, keep marrying and fathering children with women who have a higher likelihood of longevity, which from your description sounds as if it's already being done, intentionally or not.
The X chromosome of the male XY is the contribution of the mother, after all. One X of the female XX is the contribution of the father.
Of my four grandparents, three lived to ninety or more, one died at 57 from a heart attack. Guess which one I most closely resemble? I've given the subject some thought, lol.