On their father's side especially, they've got great genes for living a long time. Those folks all make it well into their 90's.
I've already told them that if they are still around on July 4, 2076 -- and they should be, as one will be 94 and the other 89, a piece of cake given their genetics -- they need to go to Washington DC and spend that day on the Mall, and tell every person they meet, "Our parents were here one hundred years ago!"
We were, their father and I, both on the Mall on July 4, 1976, although we wouldn't meet for another couple of years. But how cool would that be? Imagine being somewhere like that and having a couple of old guys tell you their parents were there one hundred years earlier.
As I said, I believe in long term planning. 
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