04-09-2008, 06:18 PM
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The age at which horses stop noticeably gaining height can vary quite a lot - between 3 and 6 usually. However, Very few horses will stop growing completely before 6 years, even though the changes may be unnoticeable and at 4 years most horses will only just have their major joints maturing.
British Native breeds? You're looking at not being anything like mature until 4 yrs. I deal almost exclusively with them, and it's not unusual for them to gain a couple of inches or completely change in appearance as they mature between the ages of 4 and 6.