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All horses are considered to have a "birthday" on January 1st, regardless of what was the actual date of birth of each horse. This can be a serious matter in the Kentucky Derby, where only "three year old" horses are eligible to run. If a horse was born on Dec. 31st, it is considered one year older than a horse born on Jan. 1st, and would therefore only be eligible to race in the Derby when it was chronologically less than two and a half years old.

Read more: http://wiki.answers.com/How_old_can_the_horse_be_in_the_Kentucky_Derby#ixzz1J9V7yNJA

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14y ago

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