I'm basing this on his autopsy photo, which is a heck of a way to judge, but it's the only picture we'll ever have of him nekked, or even near to.
I had always thought he was this frail, tall, bent-over man, selling eggs thru his back door, whose days were numbered (or hours, as the case may be). Does anyone know how old he was in that photo of his we always see, a head shot in his black suit? (I was surprised to read recently that Abby was only like 54 when her usually-seen photo was taken.)
Abby had some things that we could call real health problems. She was overweight, which nowadays we know is bad for you. And they found that female problem - oh, memory don't fail me now... Well, it did fail me (thanks a LOT, memory!) I don't know what would happen to her since it was left untreated.
But I was surprised to see Andrew's unclothed body. It looked like the body of a much younger man than I expected. And the doctors didn't find a thing wrong with him.
But did they really LOOK?

I am inclined to think that had Lizzie waited, Abby would have died first. And Andrew may have lived a long time after. If he lived till he was 90, Lizzie would have been about 52 and, geez, she died at what, 65 or 66? And Emma would have been about 61 and probably senile or close to it. (I'm thinking her death certficate read that she was senile the last two years of her life.)
I think someone commented on the Forum earlier that just because the life expectancy in 1892 was ____, there were a lot of people that lived a very long time.