Hahahaha.....33 is nothing nowadays.
Zola was 33 when he left Chelsea and was still at the top of his game. Bergkamp stayed with Arsenal until he was 36 and again still a quality player. Teddy Sheringham was 35 when he left Manu which made him 33 when he scored in their CL triumph over Bayern in 1999.
Madini is another who played well into his 30's, so if you keep your body in shape you can play at the top level for as long as you want. Stanley Matthews played until he was 50.