I think Andre Agassi winning one at almost 33 and then reaching another slam final at 35 was better. And his career wasn't aided by the sports science athletes are today.
I just think being 33 shouldn't be half as much an obstacle to Federer getting to a final as you're making out. He's spent the last few years conserving himself, picking his battles and changing his game, fair play. Being 33 means he knows the game, and his game, inside out. He reached a final for the first time in 2 years on his best surface. Well done to him, but don't make out it's a magical feat.