Player, the keeper is normally #1
Kanu still plays for his club Portsmouth.
Never he still plays, check out Vasco De Gama
At about after 4 or 5 years they retire.
Normally the left back or full back wears number 3. He is normally left footed.
You can be a pro soccer player as long as you are good, fit and playing well. Most players retire in their thirties when they find younger players, just a little bit faster, are taking their jobs.
Just about every team has a player with the number 5, normally a wing-defender.
Because he's old.
I'm not very sure. But there was a 19 year old I heard, who was injured on his debut, and after the match, he retired from FOOTBALL, not soccer. Stanley Matthews retired from professional football at the root age of 50.
A soccer player.
Persistent injuries and advancing age.
Soccer Player mate