What age do girls start their periods?

Most girls start their period somewhere between the ages of 9 and 16. The average is around 12, but there's a big range of normal.

When you start depends on things like genetics (when your mum started is often a rough guide), your overall health, and just how your body develops. Some people start earlier, some later. Both are normal.

Your period usually arrives about two years after your breasts start developing. So if you've noticed changes there, your period might not be too far off. Other signs it could be on its way include a growth spurt, hair growing under your arms and around your vulva, and vaginal discharge (a clear or white fluid in your underwear).

If you're 16 or older and haven't started yet, it's worth mentioning to a doctor. It's probably nothing to worry about, but they can check everything's fine.

Most girls start their period between the ages of 9 and 16. The average age is around 12.

When you start depends on things like when your mum started and how your body develops. Some people start earlier, some later. Both are normal.

Your period usually comes about two years after your breasts start growing. Other signs it might be coming soon include a growth spurt, hair growing under your arms, and a clear or white fluid in your underwear.

If you are 16 or older and have not started yet, it is worth telling a doctor. It is probably fine, but they can check.