I think W has the best chance to live to that age. Clinton looks sickly and Obama is a smoker. Trump will probably be dead within the next 10 years given his obesity and apparent high stress.
Obama was a smoker. Still just as bad, but had to nitpick lol please forgive me.
As for who makes it to 100, I could def see W. doing it 3 decades from now but don't discount Carter doing it in 6 years' time: the man beat back brain cancer in his 90's! He's strong af, & maybe particularly enough to make it 6 more years.
