Egg freezing at 40 and after: the real odds by age

Egg freezing at 40 gives you roughly a 51% modeled chance of at least one live birth from 20 mature eggs, or about 42% after the honest frozen-versus-fresh adjustment. Real cohorts land lower: women who froze at 40 or older had a 19% live-birth rate per patient in a 2024 meta-analysis. Donor eggs run near 47% per transfer.

Forty is the age where the arithmetic stops being encouraging and starts being a trade-off. It is also the age where the gap between what a clinic's calculator shows you and what happens to real patients is widest. This page puts both numbers next to each other, year by year, from 39 through 44, because the questions "is it worth freezing eggs at 39," "what about 42," and "can I freeze my eggs at 44" are the same question asked from different points on one steep curve.

Your odds at 40, and at 39, 41, 42, 43 and 44

The engine behind our numbers is the Goldman model (Brigham & Women's Hospital and NYU, Human Reproduction 2017), the same tool clinics use in counseling. It multiplies four things together: how many frozen eggs survive warming, how many of the survivors fertilize and reach the blastocyst stage, how many of those blastocysts are chromosomally normal, and how many normal blastocysts become babies. At 40 the third step is what breaks. About 35.9% of blastocysts are euploid at 40, down from 44.0% at 39, and by 44 it is 12.7%.

Compounded, each mature egg you freeze at 40 carries about a 3.5% chance of eventually becoming a live birth. At 39 it is 4.8%. At 42 it is 2.2%, and at 44 it is 0.8%. Everything below follows from those four numbers.

You can run any combination of age and egg count in our egg freezing success rate calculator, which shows the adjusted range rather than the flattering headline number.

Why 39 and 40 are not the same year

People treat 39 and 40 as a single decision. The model does not. Twenty eggs frozen at 39 gives 63% modeled, 51% adjusted. The same twenty eggs at 40 gives 51% modeled, 42% adjusted. That is roughly a fifth of your odds gone in twelve months, at a point on the curve where you still have enough odds left to lose. If you are 39 and deciding whether to start now or after one more busy year, that is the number to weigh. The same logic one step earlier is covered on egg freezing at 38.

How many eggs do you need at 40?

To reach a 75% modeled chance of at least one live birth, the model says 38 mature eggs at 40. At 39 it is 28. At 41 it is 47, at 42 it is 61, at 43 it is 94, and at 44 it is 170.

Those last numbers are where honesty matters more than precision. A retrieval cycle banks far fewer mature eggs than those targets imply — the HFEA reports around 7 to 14 eggs collected for patients under 38, and yields at 40 and above sit below that band. Thirty-eight eggs at 40 means three cycles, sometimes four. Sixty-one eggs at 42 means five or more. Ninety-four at 43 and 170 at 44 are not targets any real patient reaches; they are the model telling you it has run out of useful advice. That is why our calculator's slider stops at 40 eggs. Past that point it would be extrapolating well beyond anything a person actually banks, and a big confident-looking percentage would be misleading.

The professional guidance says the same thing more formally. The American Society for Reproductive Medicine's 2021 guideline concluded that "there is insufficient evidence to counsel women of various ages on the absolute number of oocytes necessary to achieve a reasonable probability of a live birth after planned OC." Its cited estimate for ages 38 to 40 is about 26 mature oocytes for a 70% chance, which is lower than our model's 38-for-75% but points the same direction: two to three cycles minimum. Our full by-age breakdown is on how many eggs to freeze.

If you want two children from frozen eggs, the math gets harsh quickly. At 40, twenty eggs gives a 16% modeled chance of two live births and thirty eggs gives 29%. At 42 those figures are 7% and 15%.

What actually happened to women who froze at 40 or later

The model is retrospective. It was built from fresh cycles and embryo screening data, not from a cohort of women who froze eggs, waited, and came back. Follow-up studies do exist now, and they are consistently more sobering than the model.

A 2024 systematic review and meta-regression in Human Reproduction Update pooled 10 studies covering 8,750 women who froze eggs electively. Only 11.1% ever returned to use them. Among those who did, the live birth rate per patient was 28% overall — but 52% for women who froze at 35 or younger, against 19% for women who froze at 40 or older.

NYU Langone's 15-year series (Cascante et al., Fertility and Sterility 2022) followed 543 patients through 800 freezing cycles and 605 thaws. The final live birth rate per patient was 51% for those whose first cycle was before 38, 34% for 38 to 40, and 23% for 41 and older. No live births were recorded from eggs frozen at 44 or older.

A 15-year UK series from the London Women's Clinic (Shah et al., Reproductive BioMedicine Online 2024) covering nearly 30,000 frozen eggs found a live birth rate of 26% per embryo transfer overall — and only 5% where the eggs had been frozen after 40. And in Cobo et al. (Fertility and Sterility 2016), cumulative live birth rates were 50% for women who vitrified at 35 or younger versus 22.9% for those who did so at 36 or older.

Read these as a band, not a verdict: somewhere between 5% and 23% depending on the center, the number of eggs banked, and how the rate is counted. The model's adjusted 42% for twenty eggs at 40 sits above that band, which tells you the model is a ceiling rather than a forecast.

Is it worth it at 39, 42, or 44?

At 39, yes, for most people who can afford two cycles. Twenty-five to thirty eggs gets you to 71–77% modeled, 58–63% adjusted, and 39 still sits inside the age band where real cohorts show meaningful returns. The strongest argument for freezing at 39 is not the odds themselves but the fact that they will be a fifth lower next year.

At 42, freezing is defensible but should be framed correctly. Twenty eggs gives 37% modeled and 30% adjusted, and reaching twenty mature eggs usually takes two or three retrievals. That is a real chance, not a token one, but it is a chance of one child, not a family plan.

At 43 and 44, the numbers do not support egg freezing as a primary strategy. Forty eggs at 44 — a volume almost nobody banks — still lands at 28% modeled and 22% adjusted, and the largest US series recorded zero live births from eggs frozen at 44 or older. Some clinics decline elective freezing at this age for that reason. If you are 44 and want a genetic child, an immediate IVF cycle with transfer is usually the better use of the same money, because it skips the freeze-thaw loss entirely. Our page on whether egg freezing is worth it works through this trade-off in more detail.

When donor eggs become the higher-odds route

This is the part clinic calculators tend to leave out. Donor eggs come from women in their twenties, so the euploidy problem that drives your odds down at 40 does not apply. In SART registry data covering 2016 and 2017, 37,657 donor-oocyte recipient transfers produced 17,725 live births — 47.1% per transfer (Kawwass et al., Journal of Assisted Reproductive Genetics 2021).

Put those side by side. At 42, banking twenty of your own eggs gives roughly a 30% adjusted chance of one live birth ever, after two or three retrievals and years of storage. A single donor-egg transfer runs near 47%. From 41 or 42 onward, for anyone whose priority is a baby rather than a genetic link, donor eggs are simply the higher-odds path, and they get more so with each year.

That is not an argument that everyone should use them. The genetic connection matters to many people, and it is a legitimate reason to accept lower odds knowingly. It is an argument against being sold your own eggs at 43 without hearing the comparison. We lay out both routes on egg freezing vs donor eggs.

What freezing eggs at 40 costs

A single US cycle runs $12,000 to $20,000 all-in: $8,000 to $15,000 for retrieval, monitoring and freezing, plus $3,000 to $6,000 for medications. Because 40-year-olds usually need two to three cycles to bank a meaningful number, the realistic banking budget is $30,000 to $45,000 or more, before storage at $500 to $1,000 per year.

The back end is the cost most estimates hide. Thawing, fertilizing via ICSI and culturing to blastocyst runs about $13,200, and the frozen embryo transfer adds roughly $7,200. A full lifecycle at this age can pass $50,000. Our cost breakdown itemizes each stage, including cheaper cycles in Spain and the Czech Republic.

Deciding at 40

Three things are true at once. Egg freezing at 40 is not futile: half of the modeled probability with twenty eggs is still real, and women in these cohorts do have babies from eggs frozen in their early forties. It is also not the insurance policy the marketing implies, because a 19% live-birth rate among returners is a minority outcome. And past about 41, an honest conversation has to include donor eggs, because that is where the odds actually are.

Treat every percentage on this page as directional, especially at 43 and 44. The model's euploidy figures come from small samples at the oldest ages, the 60% live-birth-per-euploid-blastocyst assumption varies widely between laboratories, and no model can price your own ovarian reserve. Get an AMH level and antral follicle count, ask your clinic for its own thaw outcomes by age at freezing rather than its overall rate, and make the decision with a board-certified reproductive endocrinologist who has seen your numbers.