This is an interesting perspective for me to read. I never considered the idea that the elderly have different "ages" among themselves. Thank you for sharing this.
I do know that among my own friends that they are starting to look a little rough and thy simply accept it and make the claim "getting old sucks" while they continue to abuse their bodies with all the usual poisons. As I sit and listen with zero of those problems and I'm the same age.
I can imagine a reunion of my classmates to be on par with yours. A bunch of crunchy joints on people who I once would have recognized. It'd more than likely be like that at my 25 year.
Stay young, that's the secret of living.
All the best