interesting qn... i think murray will age better too...
adding a twist to the qn... do you think any of these 3 will age as good as agassi at least...? personally i feel that neither will age as well as federer... i consider federer age better than agassi -- unless in the next 2-3 years federer suddenly take nose dive...
Don't think any of these guys will have Agassi's success at age 35 as all of them will retire well before then. Agassi had long periods away from the top - these guys haven't. The battle is far more intense and physical than it was in the 90s too. It's the same guys in the SFs and Fs everytime - takes its toll.
I could see Fed retiring after next season - I don't think he'll be able to compete at the slams with the other 3 for much longer - at the end of 2 weeks, best of 5 set matches, looking at how gruelling these SFs and Fs are becoming, for him to beat 2 of Rafa/Novak/Andy is a big ask. He's also vulnerable to big hitters. Yes Wimbledon just happened but to me that was one last hurrah - like Sampras winning the US Open at the end - the trajectory will only be downwards from now and I can't see Fed wanting to stick around if winning a slam looks to be a tough proposition.