Peter Gibbons wrote:
Famous people in their 90s who are still alive
You can just say "Famous people in their 90s."
If they are "in their 90s," they are by definition still alive.
If they are not "still alive," they are by definition not in their 90s.
Unless you would say Hugh Heffner, Queen Elizabeth, Marilyn Munroe, Fidel Castro, Chuck Berry and Johnny Cash are "in their 90s."
Or that Elvis and Buddy Holly are "in their 80s."
LOL.
To you interesting question, though, it is crazy to me that Yoko Ono turned 90 this year.