As a comparison, Shaquille O'Neal is so old that he played against Larry Bird! (Actually went to his first game at the Boston Garden).
Ya, think about Shaq, how many current coaches and GM's did he play against?
Off the top of my head:
Danny Ainge
Doc Rivers
Scott Skiles
Kurt Rambis
Byron Scott
Vinny Del Negro
Avery Johnson
Monty Williams
Scott Brooks
Nate McMillian
Steve Kerr
Joe Dumars
(although alot of our Big 3 and Jermaine played with most of those guys too).
When Shaq was a rookie, he was on the same team as Kerr, Skiles, and Tom Tolbert.
He also played against Bernard King, Moses Malone, Kevin McHale, Robert Parish, Isiah Thomas.