While soccer players can practice and play with just about any size soccer ball, the sizes most commonly recommended are:

Age	Ball Size
5 - 7	3
8 - 12	4
13 and up	5

In cases where the divisions in our league contain children for whom the recommended ball sizes differ, we use the smaller size for our games.  The results are:

Division	Ball Size
U6 & U8	3
U10	4
U13 (boys)	4
U14 (girls)	4
U15	5