
For example, a horse foaled anytime in 2011 was considered to be one year old on January 1, 2012, and two years old on January 1, 2013. It is a weanling during the calendar year in which foaled and a yearling during the first calendar year following its foaling date, regardless of the time of year foaled. REG121.1 The age of a horse shall be computed on the basis of a calendar year starting January 1 of the year foaled. It is a weanling during the calendar year in which foaled and a yearling during the first calendar year following its foaling date.

The age of a horse is computed on the basis of a calendar year starting January 1 of the year foaled.
