Roger Federer continues to be a major force in the men 's game despite his advancing years . The Swiss champion heads a rankings list with 24 players over 30 in the top 100 . He has won three of four majors this year and is currently ranked No. 1 for the first time since he was 19, according to ATP statistics. Strength was a key factor in Agassi 's longevity allowing him to play with `` great relevance '' up until age of 36 .
Roger Federer continues to be a major force in the men 's game despite his advancing years . The Swiss champion heads a rankings list with 24 players over 30 in the top 100 . Andre Agassi 's fitness coach Gil Reyes says modern game takes great toll on body . Strength was a key factor in Agassi 's longevity allowing him to play with `` great relevance '' up until age of 36 .