:smack: This was answered in the post immediately prior to yours, but let’s look at numbers.
Warren is 6.59 years younger than Biden. That’s most of a decade.
A 70 year old woman has the same probability of dying as a 64½ year old man. A 77 year old man has the same probability of dying as an 80-year old woman. Thus, assuming illness rates correlate with death rates, Biden is effectively at least ten (gender-adjusted) years older than Warren. Yes, that’s Ten with a T. 
Of course, those are average numbers, and I’m the first to scream objections when overall averages are applied to specifics. All three of the front-runners seem healthy and strong for their respective ages (and all three seem healthier than Trump). Among the group,*** it is Warren whose stamina seems most impressive.*** How many “selfies” have already been taken with Warren since she began campaigning? 40,000+ by one estimate!
No. Ten years. With a T.