Come on man.
Had Federer said he was at his best when he was 26 then I wouldn't have quoted you in first place. Comparing 26 to 34 years makes no sense since the former is at his peak/prime while the later is not. Anyone with a little tennis knowledge in his pinky knows 2007 Federer would decimated old 2015 Federer at any surface. We don't take Federer's words because it's crystal clear that he was BETTER at 26 than at 34(except some Nole fans only start watching tennis in 2011), Federer is wrong. However current 26 Tsisipas is at a golden age so we give him the benefit of the doubt, but not for a 34 Federer. NO, comparison between the two is not the same!
If Tsisipas at 34 in 2033 is going to say he's playing his best tennis, we all would've LOL at him, just like we did to Federer in 2015(and I'm a fan of him).
What does a 30 years old Wawrinka has anything to do with Federer? And you are judging Wawrinka playing at his best because he beat your boy at the USO and FO. No way Wawrinka wins anything in Federer era, he's not beating Federer at the USO, let alone Nadal at the FO. Try not to bring up random name player to to muddle the argument