For most women, age is the most important factor affecting your fertility. Typically, women have higher chances of conceiving upto mid-30s, after which their fertility starts to gradually decline. If there was an ideal age to conceive, or say, to freeze your eggs, what is it for any woman? At what age are you the most fertile?

The proverbial biological clock is no myth. Fertility in both men and women declines with age but in women, it happens much sooner—in their 30s.

So, why does female fertility drop over time? It has to do with the quantity and quality of eggs, both of which naturally decline as you age.

Best age to get pregnant

How many eggs do I have left?

  • At birth, you will have around 1 million eggs
  • At puberty the ovaries hold around 300,000 eggs
  • By 37 years, the number of eggs decreases further to around 25,000, and there’s a 20% chance of getting pregnant in any given month
  • After 37, the number declines more rapidly and at 40 years there’s only around 5% chance of getting pregnant in one cycle
  • By the time you hit menopause only 1,000 eggs remain and these are not fertile

What are the odds of getting pregnant by age?

Each month a healthy woman has between 15% to 25% chances of conceiving, if she is under 35 years old. By 40 years, this drops to just around 5%.

Odds of getting pregnant by age

According to a large North American study that involved 3,000 couples trying to conceive naturally, a woman of 25-27 years has almost 80% chance of conceiving within 12 months of trying.

Below is the pregnancy chart by age in 20s, 30s, and 40s:

Female ageCumulative pregnancy proportion in 1 year
21-24  70.8%
25-27 79.3%
28-30 77.9%
31-3376.6%
34-3674.8%
37-3967.4%
40-45 55.5%

At what age does a woman stop being fertile?

You must already know that the chances of complications in pregnancy and the risk of miscarriage both increase after a woman crosses 40 years, which is why PGT improves IVF success rates, especially in women of advanced age.

Of those who conceive naturally between 40 and 44 years, 34% of the women face miscarriage and after 45 years, this rate is up to 53%.

Note that even though a third of the pregnancies in early 40s end in miscarriages but most of them do not. However, that doesn’t mean you should wait until 40 to have a baby.

Technically, it is at menopause, when your ovaries have officially shut down but the eggs start to wither many years before that.

So, what is the best age for conceiving based upon the quality of your eggs?

When are you the most fertile?

Most of us do not have the choice of deciding at what age we can get pregnant, but if you did have the choice, what is the ideal age for a woman to get pregnant? What is the ideal age to freeze your eggs before the fertility decline starts?

While it varies from woman to woman, the average fertility peak is considered to be 24 years, when over 90% of your eggs are chromosomally healthy.

Between 20-25 years, you have over 95% chances of conceiving after trying for 12 months. If any, fertility issues are more likely to be with younger males (under 25 years).

So, your early-to-mid 20s are the most fertile years for a woman, but for various social and professional reasons, not many would think to get pregnant or consider preserving their eggs at that age.

If we could have a system to preserve 3-4 eggs of a young woman without administering any outside drugs or hormones, while she’s still in her early 20s, we could be easing a lot of this infertility crises.

However, until we device such systems, you need to take care of your fertility and measure it regularly to know when is the ideal time for you to freeze your eggs.

How to gauge your fertility levels?

Not every woman faces a sudden fertility decline at 35 and even today, a higher number of women conceive naturally at that age than those who don’t. But if you’re somewhere in your 30s and wondering about your odds of getting pregnant, you can do the test for Anti Mullerian Hormone (AMH).

AMH test is ordered by the doctors to check your ovarian reserve and you can consult with a fertility expert to understand if you need to immediately opt for cryopreservation of eggs or you can wait for a few years.

When it comes to the quality of eggs, it is believed to decline in most women after their mid-30s but even at 35, you have 15-20% chance of conceiving in any cycle, which means around 78% chance of getting pregnant naturally within one year.

There are a few other fertility tests for women that can help you understand your current fertility levels, but there isn’t any fixed test that can determine the how healthy your eggs are.

So, if you’re anxious about the age and health of your eggs, get the hormone tests done and consult with a certified expert to understand at what age were you the most fertile, what are your current fertility levels, and if you need to preserve your fertility for conceiving in future.

At what age are you the most fertile? the answer is likely to be in your mid-20s. However, to understand your unique situation, you may get a few tests done and get the opinion of more than one doctor before jumping into expensive treatments that you may or may not need immediately.

Resources:

Waiting to have a Baby? Advancing age decreases your ability to have children. https://www.asrm.org/resources/patient-resources/google-adwords-landing-pages/waiting-to-have-a-baby/

Wesselink, A. K., Rothman, K. J., Hatch, E. E., Mikkelsen, E. M., Sørensen, H. T., & Wise, L. A. (2017). Age and fecundability in a North American preconception cohort study. American journal of obstetrics and gynecology217(6), 667.e1–667.e8. https://doi.org/10.1016/j.ajog.2017.09.002

Magnus, M. C., Wilcox, A. J., Morken, N. H., Weinberg, C. R., & Håberg, S. E. (2019). Role of maternal age and pregnancy history in risk of miscarriage: prospective register based study. BMJ (Clinical research ed.)364, l869. https://doi.org/10.1136/bmj.l869

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