Okay, my vanity is inquiring...

How do all you fellow women cyclists wear your hair? Short? Long? Medium?

Ponytails, braids, clips?

Damage from helmets?

I'm turning 40 in April. I recently lost 15 lbs. I love my new hobby. I am thinking of cutting my shoulder length hair a la Keira Knightley. Is short hair a good thing for under the helmet?

Please help me rationalize an expensive haircut.