Written by the Cycella editorial team · Last reviewed October 11, 2026
Published October 11, 2026

What age do periods start? Your first period explained

The short answer

Most girls get their first period at about 12 years old, and the usual range is about 10 to 15, and some start as early as 8. Some start earlier, some later, and both can be normal. There is no way to know the exact date in advance, but there are body changes that come first, and they give a rough warning.

What age do periods start?

• Median (middle) age: about 12
• Common range: about 10 to 15, and some start as early as 8
• Doctor check suggested: bleeding before age 8, or no period by age 15

Age depends on genes, body weight and general health. You are likely to start at a similar age to your mother or older sisters, though it is not a rule. Our guide on first periods and what is normal covers more.

Can you get your period at 4?

A period at 4, or any bleeding from the vagina in a young child, is not normal and needs a doctor or health worker to check, even if it happens once. Bleeding before age 8 can be a sign of early puberty or of another cause, such as an injury or infection. It is usually treatable, but it should be checked soon.

The order puberty happens in

Puberty usually follows a pattern, and the first period comes fairly late in it:

1. Breast buds appear, usually the first sign, between ages 8 and 13
2. Growth spurt begins, and feet and hands grow
3. Pubic and underarm hair begins to grow
4. Body shape changes, with wider hips
5. Vaginal discharge begins, clear or white, often 6 to 12 months before the first period
6. First period, typically about 2 to 2.5 years after breast buds appear

That order is the best clue. If breast buds appeared a year ago, a first period is not yet likely. If they appeared two years ago and you have noticed discharge, it could be soon. See signs your first period is coming.

When will I get my first period?

You cannot know the exact day. A reasonable guide:

• Check where you are in the puberty steps above
• Look at when your mother or sisters started
• Watch for white or clear discharge, which often comes some months before
• Expect it roughly 2 to 3 years after breast development began

Once it starts, cycles are often irregular for a while. ACOG says 21 to 45 days is normal in the first years. See irregular periods in teens.

What the first period is like

It is often light, and brown or dark red at first. It may last 2 to 7 days. Read how long a first period lasts for more. Keep a pad or two in your school bag so you are ready.

When to see a doctor or health worker

• Bleeding before age 8, or breast development before age 8
• No period by age 15
• No period 3 years after breast buds first appeared
• Periods that started and then stopped for more than 90 days
• Very heavy bleeding, or severe pain that stops you going to school

Delay can be due to many things, including low weight, a lot of sport, long illness, hormones or thyroid. Most are easily found and treated.

Do not compare yourself

Starting early or late says nothing about you as a person or about your future health. It can feel hard if friends start before you, or if you start before your classmates. Talk to a parent, sister, teacher or health worker you trust, and ask them questions, however small.

Track from day one

When your first period comes, write down the first day. After a few periods, you will start to see your own pattern. Use our next period calculator when you have two or three dates. Cycella (for ages 13 and up) logs periods with no account, and keeps data on your phone. It is free on Google Play for Android. A paper note or phone calendar works too.