Fertility in women by age: what changes after 30, 35 and 40

In short: A woman's fertility is highest from her late teens to her late 20s. It starts to fall slowly after 30, more noticeably after 35 and faster after 40, because both the number and the quality of eggs go down with age. Many women still have healthy pregnancies in their 30s and 40s. See a gynaecologist if you have tried for a year under 35, for 6 months at 35 or older, or sooner if you are over 40 or have irregular periods.

If you are thinking about a baby, now or in a few years, it is natural to wonder whether age matters, especially when relatives keep reminding you. The honest answer is that age does matter, but it is only one part of the picture.

Let's look at what really changes, what stays in your control and when it makes sense to get checked, without fear and without pressure.

Why age affects fertility

You are born with all the eggs you will ever have. Every month, a group of them starts to grow, and usually one is released. Over the years, two things happen:

• The number of eggs goes down. This is sometimes called your egg reserve.
• The quality of eggs changes. Older eggs are more likely to have changes in their genetic material. This makes it harder to get pregnant and raises the chance of miscarriage.

This is a normal part of ageing, not something you caused. It happens at a different pace for each woman.

Fertility at different ages

• Late teens to late 20s: This is peak fertility for most women. Periods are often regular and eggs are plentiful.
• After 30: Fertility begins to fall slowly. Most women in their early 30s still conceive without help, though it may take a little longer.
• After 35: The fall becomes more noticeable. It may take longer to get pregnant, and the chance of miscarriage and some pregnancy problems rises. Many women still have healthy babies. You can read more in Pregnancy after 35: breaking the stigma.
• After 40: Fertility falls faster. Getting pregnant naturally is still possible, but it is harder, and it is wise to see a gynaecologist early rather than waiting.
• Around menopause: Periods become irregular and then stop. Once you have gone through menopause, natural pregnancy is no longer possible.

Men's age matters too

Fertility is a couple's matter, not only a woman's. Sperm quality also falls with age, more slowly, often from around 40. Smoking, alcohol, heat, stress and weight affect sperm too. When a couple has trouble conceiving, both partners should be checked. A simple semen test is part of the first visit.

Other things that affect fertility

Age is not the only factor. These can matter at any age:

• PCOS and thyroid problems, which can stop regular ovulation. See PCOD vs PCOS to understand the difference.
• Endometriosis and fibroids.
• Blocked fallopian tubes, sometimes after a past pelvic infection.
• Being much underweight or overweight.
• Smoking and heavy drinking.
• Past surgery on the ovaries.

What is an AMH test?

AMH is a simple blood test that gives a rough idea of how many eggs you have left. A gynaecologist may suggest it if you are planning ahead, have irregular periods or are thinking about fertility treatment.

It is useful, but it has limits. AMH does not tell you about egg quality, and it cannot predict whether you will get pregnant naturally. A low result does not mean you cannot conceive, and a normal result does not guarantee it. Always discuss the result with your doctor rather than reading it alone.

What you can do to protect your fertility

• Eat balanced home food: dal, vegetables, fruit, whole grains, curd and enough protein.
• Stay active and aim for a healthy weight.
• Stop smoking and cut down on alcohol, both of you.
• Sleep well and find small ways to manage stress.
• Get regular check-ups and treat thyroid problems or PCOS early.
• If you want to delay pregnancy, ask a gynaecologist about options such as egg freezing, ideally before 35.

When to see a gynaecologist

See a gynaecologist about fertility if:

• You are under 35 and have been trying for a year without success.
• You are 35 or older and have been trying for 6 months.
• You are over 40 and planning a pregnancy, even before you start trying.
• Your periods are irregular, very painful or very heavy, or have stopped.
• You have known PCOS, endometriosis, a past pelvic infection or ovarian surgery.

Go to a doctor the same day if:

• You have a positive pregnancy test with pain or bleeding.
• You have severe or one-sided tummy pain.
• You have fever with pelvic pain, or foul-smelling discharge with fever.
• You are bleeding heavily, soaking a pad every hour for 2 hours or more.
• You feel faint or dizzy.

A doctor will ask about your cycle and health, and may suggest blood tests, an ultrasound, a test to check your tubes and a semen test for your partner.

Questions women ask

At what age is a woman most fertile?

Most women are most fertile from their late teens to their late 20s. Fertility stays fairly good in the early 30s and then falls more noticeably after 35. Every woman is different, so your own health and cycle matter too.

Can I get pregnant naturally after 35?

Yes, many women do. It may take longer, and the chance of miscarriage is higher than in your 20s. If you have been trying for 6 months without success, see a gynaecologist so that any problem can be found early.

Is it possible to get pregnant over 40?

Yes, it is possible, but it is harder because egg number and quality fall faster after 40. It is a good idea to see a gynaecologist before or soon after you start trying, so that you can make a plan together.

Does fertility drop after 30?

It begins to fall slowly after 30, but most women in their early 30s can still conceive without help. The change becomes bigger after 35. Healthy habits and treating problems like thyroid or PCOS early help at any age.

Does a low AMH mean I cannot get pregnant?

No. A low AMH means fewer eggs are left, but it does not measure egg quality or your chance of a natural pregnancy. Many women with low AMH conceive. Your gynaecologist will look at it along with your age and other tests.