How many chess grandmasters have been in their prime after age 45?

Not still strong, actually better than they previously were [also, if different, I would like to know how many of them were playing serious chess from their 20s onward.|||There are no top chess grandmasters with a year of birth before 1965

on the FIDE Top Players lists, July 2011 (active players), Top 100 Players.|||Not many. The only one I can think of was David Bronstein, born in 1924, who kept playing at the very highest level for a very long time after 45.