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Well, it depends on the breed of horse..... the average horse, however will be grown to its full size when it is 2-4 years old.

Fun Fact: jockeys use 2-4 year old horses in races because, they are fully grown, show a lot of spirit, more energy (than most older horses), and most likely can run faster than older horses.

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13y ago

What else can I help you with?