most tennis players (most athletes, really) who rely on a particularly athletic, explosive approach to their sport tend to drop off a cliff at some point. edberg played a young man's brand of tennis. i think about mike tyson the same way--even had he not gotten bogged down by his various issues, that high intensity peek-a-boo style isn't the kind of thing you can 'coast' on in your later years, he was never gonna be a force past his mid-late 20s.
I think it was a different time in Tennis too. Most studs retired young or peaked late 20s Connors and to some extent Agassi were exceptions.
If you look at Edberg’s game as opposed to what the big 3 have to put up with in terms of long drawn out baseline battles these days even at their ages. their games take much more of a toll on the body than did Edberg’s. But everything is different now. Diet, Fitness, Off the court recuparation and medical science. Most importantly the mindset that 30 is not too old.