How old is a filly when it becomes a mare?

Question

How old is a filly when it becomes a mare?

Answer 1

Female horse 5 years old or older. Also, female of any age who has been bred.

actually since this is a horse racing subforum  the actual answer would be  a Female horse 5 years old or older. or any , female of any age who has been bred.

for non racing horses the answer would change.

Answer 2

4 years of age.

Answer 3

Hockey Gal has it correct, in horse terms:

filly- female horse under 4 years of age

colt- male horse under 4 years of age

mare- female horse 4 years old or older

stallion- male horse 4 years old or older

gelding- castrated male horse

Answer 4

At 5 years old unless she is bred before 5 at that point she becomes a mare.

Answer 5

Actually, a filly becomes a mare once she turns 4.

Answer 6

big 5 yrs