Roger Federer, right, could surpass Andre Agassi, who held the No 1 spot in 2003 aged 33 years and 131 days. Dita Alangkar / AP Photo
Roger Federer, right, could surpass Andre Agassi, who held the No 1 spot in 2003 aged 33 years and 131 days. Dita Alangkar / AP Photo

'Age is just a number' for Roger Federer as he targets No 1 spot in Rotterdam