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Summary: Most horses tend to stop growing around the age of 4, although they can occasionally keep growing for a couple more years. Avoid giving a horse under age 4 strenuous work with help from an equestrian and horse riding coach in this free video on horse training.
Mara Keith-Hunter is a lifelong equestrian and head coach for the Hampshire College equestrian team. She rode in the Intercollegiate National Horse Show for both the University of...read more
"This is a quarter horse, and quarter horses tend to stop growing around the age of four. Most horses tend to stop growing around the age of four, although, certainly sometimes it can be more like five years old. And it's even been reported that up to the age of six with some horses. But as a general rule, four years old is usually about the time that they stop growing. And for that same reason, they usually recommend that you not jump your horse until they're four, and not do any other kind of strenuous work until they're four, just because that, until then they're joints aren't finished growing, and you can do some damage to those joints. So, usually when they stop growing, at the age of four is also when they start to fill out. So rather than growing up at that point, they start to put on a little more muscle, a little more width and mass, and they fill out their whole body, so they're a little less scrawny and gangly looking."