When you look at the history of womens tennis these are the ages some of the games greats have won their final slam titles at: Navratilova- 33 Evert- 31 Graf- 29 Court- 31 King- 31 So what age will Venus and Serena win their final slams each at. My guesses would be: Venus- 28. Already IMO happened at Wimbledon last year. Serena- 29. Will happen sometime in 2011.