Originally Posted by Prisoner of Birth
Because you could only come up with 3 other instances, one from decades ago and one from the WTA?
oh there are plenty more if you wish:
Rosewall reaching Wimbledon and U.S Open finals at 39.
Sampras winning the U.S Open, the most physically demanding slam in tennis with the schedule (proof of that in Federer who last won it at 27) at 31.
Lendl ending a year ranked #1 in the World at 31.
Navratilova reaching the finals of Wimbledon at 37.
I am sure one of or both of Djokovic and Nadal will be adding to the list in several years time.