He's 38. There's no mystery.Didn't you say you admit Federer is running out of gas? Help me follow you here.
Stop trying to open a new argument.Do you believe Federer in present state current state would've knocked Nadal out of the Australian Open?
If Federer has any chance to win another major, it's Wimbledon and the US. At those tournaments, Djokovic will be the major obstacle, to the point that Federer probably can't beat him. That is not the case with Nadal.