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OhYes
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Agassi surpassed Federer in that department no matter in what condition he was. So his era must be very weak.Agassi was doing it tough in his late career, getting injections after every game for his back. Fed on the other hand must be doing something right, he looks in good nick ! maybe some undetected dopingAgassi at this age much better than fed, oldest #1 also.
We had old players winning GSs all the time. Newcombe - 31, Laver - 31, Emerson - 31, Rosewall - 38, Connors - 31, Gomez - 30, Korda - 30, Sampras -31, Agassi - 33. All from weak eras.

What do you think makes Federer running for more ? He knows about this, and in times when medicine and fitness are at their peak, he has every right to hope he will win some more until retirement. Fact that his last slam was with 30 years of age, makes this era with good credentials (age-wise).