because that how old he was when he started playing
michal Jordan did not choose the #23 the bulls choose it for him, most rookies in any major league sport do not have control over what number they will wear.
45
23
24
48
10
Michael jordan
jordans older brother Larry use to wear the #45, Jordan wanting to be like his brother wanted to wear the same number which was already taken. so he split the number in half which is 22 1/2. there is no such number in basketball so he took 23.
You've confused Carson Palmer with his younger brother Jordan. Jordan Palmer wears number five.
Jordan Henderson wore jersey number 14 in the 2014 FIFA World Cup.
Jordan Ayew wore jersey number 13 in the 2014 FIFA World Cup.
Jordan wore number 23 primarily. He wore 12 and 45 too. For Team USA he wore 9.