What Age Should You Freeze Your Eggs?

There’s no single “right” age — but the science is clear on when egg quality and quantity start to shift. Here’s what the evidence actually shows.

The most common thing women say when they book a first egg freezing consultation is some version of: “I probably should have done this sooner.”

Sometimes that’s accurate. Sometimes it isn’t. The only way to know is to look at the actual numbers — your numbers, not a general statistic about women your age.

This article explains what changes with age, what the evidence actually shows, and how to get a real picture of where you stand.

Why age matters for egg freezing

Women are born with all the eggs they will ever have. From puberty, that supply declines - gradually in the 20s, more noticeably from around 35, and more significantly from 37–38 onwards.

This is not a medical problem. It is normal reproductive biology.

What changes over time is both quantity and quality — the number of eggs remaining, and how likely those eggs are to fertilise and develop into a healthy embryo.

The key measure is AMH (anti-Müllerian hormone) — a blood test that reflects your current ovarian reserve. Alongside an antral follicle count (AFC) ultrasound scan, it gives a concrete picture of where things stand for you specifically.

Two women of the same age can have very different AMH results. Age is a useful general indicator. It is not a substitute for your own data.

The best time to freeze your eggs — what the data shows

According to HFEA data, the average age at which women freeze their eggs in the UK is 35. The average age at which they return to use them is 40.

That five-year gap matters. It reflects the kind of window egg freezing can realistically create.

In practice, research published on PubMed and referenced in ESHRE guidance shows the following approximate live birth rates when women return to use their frozen eggs:

Under 35: around 52% live birth rate

35–37: around 49% live birth rate

38–40: around 32.5% live birth rate

41–42: around 20% live birth rate

Over 42: around 13% live birth rate

These figures come from a 2024 systematic review of more than 1,100 patients. They are per-patient averages. Individual outcomes vary depending on the number of eggs stored, quality, and response to stimulation.

The difference between “under 35” and “35–37” is small. The idea that 35 is a hard cut-off is not supported by the data.

"How many eggs should I aim to freeze?"

The answer depends largely on your age at the time of freezing, because age affects the likelihood of each individual egg resulting in a baby in the future.

Rather than focusing on a single "magic number", fertility specialists usually look at the total number of mature eggs stored and what that may mean for your future chances of pregnancy.

Research from PMC (PubMed) gives some useful benchmarks:

* Women under 38 may need around 15–20 mature eggs to achieve approximately a 75% chance of one live birth.

* Women aged 38–40 may need closer to 25–30 mature eggs to achieve a similar chance - 70%.

This is one of the reasons some women choose to undergo more than one egg freezing cycle. Needing a second cycle doesn't mean something has gone wrong. In many cases, it is simply part of building a realistic number of eggs for future use.

The encouraging news is that modern freezing techniques are highly effective. Today, vitrification (rapid freezing) allows around 90% of eggs to survive the thawing process, meaning that most of the eggs you freeze are likely to be available when you need them.

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What about freezing your eggs at 40 or over?

This is one of the most common questions we hear. Many women come to Plan Your Baby in their late 30s or early 40s - wondering whether they've missed their opportunity to preserve their fertility. Often life simply has not allowed them to do this earlier: either after waiting for a relationship, a point of financial stability, or simply the right moment that kept not arriving.

The honest answer: The reality is that age alone doesn't tell us enough, it also depends on your ovarian reserve.

At 40 and above, egg quality and quantity are lower on average, however we still see significant differences between women of the same age. Some women in this age group respond well to stimulation and freeze a meaningful number of mature eggs across one or two cycles. Others have a lower response. This is why we encourage women not to make assumptions based on age alone. The only way to understand which picture applies to you is to run the baseline investigations.

HFEA data puts live birth rates from eggs frozen at 40–42 at around 13–20%. That is lower than earlier freezing. It is not zero, and it is not the same for everyone.

At one of our webinars, a patient shared that she had frozen 41 mature eggs — 19 at 42 and 22 at 43. Results like this are not the average. But they exist. The starting point is always your own results, not a general statistic about your age group.

Is there a cut-off age for egg freezing?

There is no universal cut-off. Clinics set their own thresholds, and these vary.

At Plan Your Baby, decisions are made individually — based on ovarian reserve, AMH levels, health history, and a direct conversation about what is realistic. We don’t apply blanket age restrictions.

In practice, what changes significantly above 43–44 is the likelihood of retrieving enough mature eggs in a standard stimulation cycle. That doesn’t mean the option is unavailable. It means the picture needs to be understood clearly before starting.

If you haven’t had a period in several months, that is a signal to get investigations done promptly - not to assume egg freezing is off the table. A consultation and investigations are informative. And it is not a commitment to anything.

One of the hardest parts for women considering egg freezing in their 40s is the fear of hearing bad news. Yet many tell us afterwards that finally knowing where they stand feels far less stressful than months or years of uncertainty.

Does egg freezing affect your future fertility or bring on early menopause?

No - and this is a concern worth addressing directly, because it comes up often.

Egg freezing does not reduce your future fertility, nor does it cause early menopause.

Every month, your ovaries recruit a group of eggs that begin developing. Usually, only one of those eggs reaches ovulation, while the rest are naturally lost as part of the normal menstrual cycle. Fertility medication works by encouraging more of those eggs to continue developing, allowing them to be collected during treatment rather than being lost naturally.

This means: retrieving eggs does not reduce your overall egg reserve beyond what would have happened anyway. It does not cause or accelerate menopause and it does not draw from your future supply.

HFEA data shows the safety profile of egg freezing is well established. Cycles across the UK increased from 4,700 in 2022 to 6,900 in 2023, with no change to that picture.

Eggs vs embryos - does the timing change?

If you have a partner or are in a relationship,, you may be wondering whether it's better to freeze eggs or create and freeze embryos instead.

From an age perspective, the answer is simple: earlier is generally better for both.

Embryo freezing provides more information before storage - fertilisation rates and early embryo development have already taken place before anything is frozen. For some couples, that’s useful and reassuring data. 

For others, where the relationship is uncertain, or where the preference is to preserve options independently, preserving eggs feels like the better option. It allows them to keep their future family-building choices open without tying those decisions to their current circumstances.

Age affects both options equally. Earlier is generally better for both eggs and embryos. The choice between them isn’t primarily about age - it’s about your circumstances and what kind of flexibility you want to keep.

What tests tell you where you actually stand

One of the biggest misconceptions in fertility care is that women of the same age have the same fertility potential. In reality, we regularly see women of the same age with very different results.

Before any decision about egg freezing, these are the two investigations that matter:

1. AMH (anti-Müllerian hormone): a blood test reflecting your current ovarian reserve
2. Antral follicle count (AFC): an ultrasound scan counting small follicles in the ovaries, giving a picture of your likely response to stimulation.

Together, they replace a general statistic with your actual numbers.

In practice, two women of the same age - say, 38 - can have completely different results. One may have a strong ovarian reserve; the other may not. No general article, including this one, can tell you which picture applies to you.

That's why testing matters. It replaces assumptions with information and allows you to make decisions based on your own fertility, not somebody else's statistics.

At Plan Your Baby, these investigations are part of the initial consultation process. Results are discussed directly with your doctor. Monitoring can be done at over 450 UK locations.

You can book your investigations directly here https://planyourbaby.co.uk/egg-freezing 

Frequently asked questions

Can I freeze my eggs after 35?

Yes. Research shows live birth rates for women who freeze at 35–37 are around 49% — close to the rate for women under 35. The idea that 35 is too late is not supported by the evidence.

In practice, the most important factor isn’t whether you’ve crossed 35. It’s your individual ovarian reserve. That’s what an AMH test tells you.

Can I freeze my eggs after 40?

Yes — but the process should start with understanding what your investigations actually show.

At 40 and above, egg quality and quantity are typically lower, and more cycles may be needed to reach a meaningful number of stored mature eggs. Live birth rates at 41–42 sit at around 20%, and lower above 43.

That doesn’t make egg freezing the wrong choice. It means the decision should be grounded in your AMH and AFC results rather than your age in isolation. A consultation will give you far more useful information than a general statistic can.

Does having PCOS affect eligibility?

Having PCOS does not prevent you from freezing your eggs. In fact, many women with PCOS have a higher ovarian reserve than average. The main consideration is making sure stimulation is tailored carefully to minimise the risk of OHSS

Can supplements improve egg quality before freezing?

This is one of the most common questions we hear. While some supplements, including CoQ10, have shown potential benefits in certain studies, no supplement can reverse the natural effects of age on egg quality. If you're considering supplements before egg freezing, it's best to discuss them with your fertility specialist so recommendations can be tailored to your situation.

Can I freeze my eggs if I have fibroids or adenomyosis?

In most cases, yes. Fibroids and adenomyosis can affect fertility and pregnancy outcomes, particularly if they alter the shape of the uterine cavity or interfere with implantation. However, they do not usually prevent egg freezing itself.

If you're considering using your eggs in the future, your doctor will review the size, location and extent of any fibroids or adenomyosis and discuss whether treatment may be beneficial before attempting pregnancy or embryo transfer.

Does egg freezing cause early menopause?

No. Egg retrieval uses eggs that would have died off in that natural cycle anyway. It does not deplete your future supply and does not bring on menopause earlier.

Ready to understand your own options?

If you're reading this because you're worried you've left it too late, you're not alone.
We hear that concern every day. The most important thing is not guessing where you stand,  it's finding out.

A fertility assessment can give you clarity, whether the results are reassuring or whether they suggest that now is the right time to act.

The most useful thing you can do is replace a general statistic with your own numbers.

An AMH test and an AFC scan give a real picture of your ovarian reserve. A consultation with Dr. Sami gives you a clear conversation about what that means for you — and what a realistic plan looks like.

There is no waiting list. You can book your investigations and consultation right away and get started within the next 48 hours.

In case you have done your investigations already, you can directly book a consultation with the doctor. 

→ Book a consultation with doctor→ Book investigations and doctor consultation

If you're reading this because you're worried you've left it too late, you're not alone. We hear that concern every day. The most important thing is not guessing where you stand,  it's finding out. A fertility assessment can give you clarity, whether the results are reassuring or whether they suggest that now is the right time to act.

Sources

HFEA Fertility Treatment 2023: Trends and Figures — hfea.gov.uk

PMC/PubMed — Elective oocyte cryopreservation for age-related fertility decline (pmc.ncbi.nlm.nih.gov/articles/PMC7894970)

PMC/PubMed — Elective egg freezing for age-related fertility decline (pmc.ncbi.nlm.nih.gov/articles/PMC7012629)

2024 Systematic Review — Live birth rates from frozen eggs by age (ESHRE-referenced data, Inovi Fertility / Cofertility)

Extend Fertility — 8 Years of Egg Freezing Outcomes by Age (extendfertility.com)