In horse racing, a filly is any female horse that is 4 years old or younger. Any female horse 5 and older is a mare.
In some other equine disciplines, a filly is considered any female horse younger than 3.
In horse racing, a filly is any female horse that is 4 years old or younger. Any female horse 5 and older is a mare.
In some other equine disciplines, a filly is considered any female horse younger than 3.