Most horses stop growing at the age of 6, and are fully matured by the age of 7.

At what age do Warmbloods stop growing?

Well-Known Member. Mine didn't stop growing until he was 9, he was 5 when we got him and 16.3hh and at 9 he finally stopped growing at 17.3hh.

What age is a horse fully grown?

Horses grow until they are six years old. However, they typically reach their maximum height at four or five years of age. The bones of horses have cartilage on either end of each bone in their body, and as the horse ages, the bones fuse, creating a bond.