Usually at age fourteen.
When you start U13 you switch to a size 5 instead of size 4.
The ball comes in three sizes. Size 3 for children , size 4 for teenagers and size 5 which is used from age 14 and up.
U14 age groups (12-13-year-olds) typically play with a Size 5 ball, though some few leagues still use Size 4.
It relates to the size of a golf ball. The average golf ball has a circumference of 4"
a Golf ball
a size 4 ball is used for high 5 netball (which is what younger players play) and a size 5 ball is what is used in 7s netball which is what adults play x
Size 5
size 4
The rules of soccer say that a size 5 ball must have a circumstance of 69 cm. Dividing 69 by 3.14 gives you 22 cm or roughly 8 inches.
The standard size of the ball
when you suck with a size 2,3 or 4
The official size for a soccer ball is Size 5, which is the standard size used in professional matches and for players aged 12 and above. However, smaller sizes like Size 4 and Size 3 are used for younger age groups.
Some countries use a full-size ball, but many recognize that U12 players might not be able to properly handle a full-size ball. Therefore, the USSF recommends that a Size 4 ball be used, which is about 2 inches smaller in circumference than a full-size (Size 5) ball.