Roger is just 26. There is no magical age when a top tennis players suddenly loses his effectiveness. Lendl finally became No. 1 at age 25 and remained No. 1 for four of the five years until he was 29 years old. The age of the No. 1 tennis player has been going up and down over the last 40 years. In 1968, Laver was 31 years; 1974, Connor 22 yrs; 1975, Ashe 32 yrs; 1977, Borg 21 yrs; 1982, Connors 30 yrs; 1987, Lendl 27 yrs (in 1989, Lendl was 29 yrs; 1993, Sampras 22 yrs; 1998, Sampras: 28 yrs; 1999, Agassi 29 yrs; 2001, Hewitt 20 yrs; 2007, Federer 26 yrs. There is not much age difference between 29-year Agassi in 1999 and 30-year Laver in 1968, or 20-year Hewitt in 2001 and 21-year Borg in 1977.
Nothing in the original post by TonyNathan
other than telling that #1 players could come back anytime. But how quickly? In one year tour, next one, or nothing at all? The post already told us the examples.
While Fed is fighting through his fitness and trying to gain more trophy this year, someone can also be better and take his crown in the end. Just like Lendl when he slipped to No. 2 in 1988. If Fed's fall is too low, than no way back for him. Anyway he's still on top, but the young gunners seem to be more deadly right now and he's been suffering in many departments.