In general, the cups become smooth in the lower center, intermediates, and corners and then the upper center, intermediates, and corners at 6, 7, 8, 9, 10, and 11 years of age, respectively. A smooth mouth appears at 11 years of age.
Partners

Originated from the American Youth Horse Council's
Horse Industry Handbook
The umbrella organization providing leadership and resources for the youth horse industry.
1-800-TRY-AYHC
