I had a great uncle who was born in about 1878 - i knew him when I was a child in the 70's - he died in about 1977. I thought he was as old as the hills - had no teeth either, and looked just like the men in these photos.
As a side note, this uncle always would tell me about a man in the town where he grew up, who, as a very young boy, had met George Washington. It amazed me - only 2 degrees of separation between me and George Washington!
As a kid in the early or mid 50s we used to watch a show, I think called True Story. Sponsored by Pall Mall. One week they interviewed 100+ year old Jesse James.
I guess a few years ago they family had his grave dug up, dan test against the family dan samples, and seems like the actual Jesse was buried in that grave after all.