Your logic is completely off. Firstly, nowadays, players are entering their prime, and consequently their decline, much later than in the years past. Being 27, 28 as opposed to 33 represents no significant advantage if any, as evidenced by Djokovic and Nadal still completely dominating the field at 33 and 34 respectively. And secondly, as the decline happens exponentially, the difference between 36 and 31 is much greater than between, say, 33 and 28, not the other way round. The reason why Federer made some ground in the H2H against Nadal is that he somewhat improved his BH, thus not allowing Nadal to obliterate it the way he used to before. If your logic were true, Federer would be making ground on Djokovic as well, which is the opposite of what we are observing. v