In horse racing, a filly is any female horse that is four years old or younger. Any female horse five and older is a mare.
In some other equine disciplines, a filly is considered any female horse younger than 3.
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In horse racing, a filly is any female horse that is four years old or younger. Any female horse five and older is a mare.
In some other equine disciplines, a filly is considered any female horse younger than 3.