Egg Freezing Success Rate by Age (Full Data Tables)

Egg freezing success rate by age

The egg freezing success rate by age depends heavily on when you freeze. Women who freeze eggs at age 35 or younger have a roughly 50 to 60% chance of an eventual live birth, while those freezing at 40 or older see their odds drop below 20%.

When evaluating the best age to freeze, it is critical to look at real-world cohort data rather than theoretical maximums. In a large vitrification cohort tracking eventual outcomes, 52 out of 100 women who froze their eggs at age 35 or younger eventually had a baby using those eggs. In stark contrast, only 19 out of 100 women who froze their eggs at age 40 or older achieved a live birth.

These baseline figures represent the reality of the technology as it stands today. They encompass the entire process: the initial retrieval, the years of storage, the thaw, fertilization, embryo development, and the eventual transfer. However, the most important statistic regarding egg freezing success is one rarely featured in clinic brochures: only 10 to 16% of women who freeze their eggs ever return to use them. The vast majority of women either conceive naturally, use alternative family-building methods, or change their life plans. Therefore, any success rate must be viewed through the lens of a backup plan that is statistically unlikely to be utilized.

The full success-rate table (age × eggs)

Your chance of a live birth is determined by multiplying your age at the time of freezing by the total number of mature eggs stored. A 35-year-old with 15 eggs has an 81% modeled chance of success, whereas a 40-year-old needs over 25 eggs to reach 55%.

The table above is derived from the Goldman 2017 counseling model, published in Human Reproduction by researchers at Brigham and Women's Hospital and NYU. This model is the industry standard for estimating outcomes and is the engine you use when you run your own numbers. It was built using data from 520 ICSI (intracytoplasmic sperm injection) cycles and approximately 14,500 PGS (preimplantation genetic screening) embryo results.

However, a critical caveat applies to this data: the model is retrospective. It is largely based on the outcomes of fresh IVF cycles applied mathematically to frozen eggs, rather than being built exclusively from women who returned to thaw their frozen eggs years later. Because of this methodology, the model may overestimate real-world success.

To practice radical honesty with these figures, we must apply the study's own internal adjustment. The authors noted a 19% lower efficiency for frozen eggs compared to fresh. If we apply this 19% honesty adjustment, a 35-year-old with 20 eggs sees her modeled 90% chance drop to a more realistic 73%. Odds should always be presented as an estimated range, never a promise.

Success rate under 35

Women under 35 experience the highest success rates, with an eventual live birth rate of roughly 50 to 60%. At this age, you typically only need to freeze 9 to 10 mature eggs to secure a 70 to 75% chance of having at least one child.

The biology of a woman in her late twenties to early thirties is highly favorable for oocyte cryopreservation. At this stage, the eggs are structurally robust, resulting in a thaw survival rate of approximately 95%. Furthermore, the genetic integrity of the eggs is at its peak. Data shows that for women 35 and under, 57.4% of the blastocysts (day-5 embryos) created from their eggs will be euploid, meaning they contain the correct number of chromosomes.

When analyzing euploid embryos derived specifically from warmed eggs, the rate sits between 20 and 30% for those who froze under 35. Because the average patient in this age bracket yields 10 to 20 mature eggs per retrieval cycle, the mathematical target of 9 to 10 eggs is often achieved in a single procedure. If a patient desires two children, she must roughly double that per-child target to 18 to 20 eggs.

Success rate at 35–37

If you freeze your eggs between 35 and 37, the overall chance of an eventual live birth is 30 to 40%. To achieve a 75% chance of one live birth, a 37-year-old needs to freeze approximately 20 mature eggs, which may require more than one cycle.

This age band represents a transition period in female fertility. The Goldman model indicates that 20 eggs yield a 75% modeled chance of success at age 37, but the biological metrics begin to show measurable decline. Thaw survival for mature eggs drops from 95% to approximately 85% at age 36. This means that out of 20 frozen eggs, a patient should expect roughly 17 to survive the warming process.

The genetic viability also shifts. By age 37, the euploidy rate of blastocysts falls to approximately 48.6%. Because more eggs will be lost to chromosomal abnormalities during embryo development, determining how many eggs you need becomes a more aggressive calculation. Women in this bracket generally need to bank 14 to 20 eggs for a 70 to 75% chance of one child, and those seeking multiple children must plan for 28 to 40 eggs, almost certainly requiring multiple rounds of stimulation and retrieval.

Success rate at 38–40

Success rates decline sharply in your late thirties. To achieve a 65 to 75% chance of a live birth, you will need to freeze roughly 25 to 30 mature eggs. At age 38, it takes an average of 40 frozen eggs to yield one live birth.

The Goldman data indicates that 30 eggs provide approximately a 65 to 75% chance of success for women in this age tier. However, generating 30 mature eggs at age 38 or 39 is a significant clinical hurdle. Ovarian reserve naturally diminishes, meaning fewer eggs are retrieved per cycle. Older patients often need two to three retrieval cycles, with the average sitting at 2.1 cycles, to bank their target number.

When looking closely at egg freezing at 38, the inefficiency of the process becomes apparent. The euploidy rate of embryos from warmed eggs drops to between 8 and 9% for women who froze between 38 and 42. This severe attrition rate is why the net requirement swells to roughly 40 frozen eggs to produce a single live birth at age 38. The math is unforgiving, and patients must weigh the physical and financial toll of multiple cycles against a probability that remains far from guaranteed.

Success rate after 40

For women freezing eggs at 40 and beyond, the eventual live birth rate falls below 20%. A 42-year-old needs to freeze approximately 61 mature eggs to reach a 75% chance of success, a target that almost always requires multiple expensive retrieval cycles.

The steep decline in success after age 40 is driven almost entirely by genetics. By age 44, the euploidy rate of blastocysts plummets to 12.7%. This means that nearly 90% of the embryos created will be chromosomally abnormal and unable to result in a healthy pregnancy. Even if a 42-year-old manages to freeze 20 eggs, the Goldman model caps her chance of a single live birth at 37%.

For women 40 and older, it is a matter of medical transparency to discuss alternative paths. Donor eggs serve as the high-odds fallback in reproductive medicine. Regardless of the recipient's age or uterine environment, transferring an embryo created from a young donor's egg yields a success rate of 50% or higher per transfer. While NYU data notes that using frozen eggs is more efficient than starting fresh IVF for older patients, the absolute odds remain low, and patients must be counseled on the realistic limits of their own oocytes.

The cryobiology funnel: From frozen egg to baby

Not every frozen egg becomes a baby. Eggs must survive the thaw, fertilize, develop into blastocysts, and be chromosomally normal. While fertilization sits at 73%, the rate of blastocyst formation and chromosomal normality declines significantly as you age, narrowing the funnel to a live birth.

The modern era of egg freezing relies on vitrification, a flash-freezing technique that prevents ice crystals from forming and destroying the cell. Under vitrification, eggs have a survival rate of 90 to 97%, compared to embryos which survive at a rate of roughly 95%. While the thaw survival is similar between the two, embryos have historically shown slightly higher per-unit success rates. However, freezing eggs preserves reproductive autonomy and flexibility regarding future partners or sperm donors.

Once thawed, the eggs are subjected to ICSI, where a single sperm is injected into each egg. The fertilization rate is approximately 73% across age groups. The subsequent step, blastocyst formation, is where age begins to take a heavy toll. As the fertilized eggs grow in the lab for five to six days, many will arrest and stop developing.

The surviving blastocysts are then biopsied for genetic testing. As established, euploidy rates drop from 57.4% at 35 to 12.7% at 44. Finally, for every euploid blastocyst that is transferred into the uterus, the live birth rate is approximately 60%, though this figure varies by clinic. This sequential loss at every stage is why a high starting number of eggs is mathematically required to yield a single child.

Costs and the realities of returning

A single egg freezing cycle in the United States costs $12,000 to $20,000 all-in, and banking enough eggs often requires two cycles, pushing totals to $30,000 to $45,000. Despite this investment, only 10 to 16% of women ever return to use their frozen eggs.

The financial burden of egg freezing is substantial and front-loaded. A primary cycle involves clinic fees for retrieval, monitoring, and the initial freeze, ranging from $8,000 to $15,000. The injectable medications required to stimulate the ovaries add another $3,000 to $6,000 per cycle. Because most women, particularly those over 35, require an average of 2.1 cycles to hit their target, the upfront costs quickly compound.

Storage fees introduce an ongoing liability, typically costing between $500 and $1,000 per year. If a patient returns to use the eggs a decade later, she faces a second wave of expenses. The thaw and IVF process costs approximately $13,200, followed by a frozen embryo transfer at roughly $7,200. A realistic total for banking, a decade of storage, and subsequent use easily exceeds $30,000 to $45,000.

For those seeking to mitigate costs, international clinics offer a viable alternative, saving patients $5,000 to $10,000 per cycle. In the Czech Republic, a core cycle costs approximately €1,800 plus medications, while clinics in Spain charge roughly €2,200 plus medications.

Beyond the finances, the psychological outcomes of the procedure are revealing. A 2023 study found that approximately 9% of women who froze their eggs experienced moderate-to-severe regret regarding their decision. However, that figure pales in comparison to the 51% of women who decided against freezing and later experienced moderate-to-severe regret. The procedure often functions as an expensive form of psychological insurance, bringing peace of mind even to the 84 to 90% of women who never return to the clinic.

How to read these numbers honestly

Clinical models provide mathematical estimates, not biological guarantees. Because success rates are based on retrospective data rather than actual thaw outcomes, they may overestimate your real-world chances. These baseline probabilities should guide your expectations, not serve as a promise of future fertility.

When navigating the data, it is vital to distinguish between cumulative, per-cycle, and per-egg reporting. Clinics often highlight cumulative success rates, which aggregate the outcomes of multiple retrieval cycles and multiple embryo transfers, making the numbers appear higher. Per-cycle rates show the odds based on a single round of stimulation, which is often insufficient for older patients. Per-egg rates offer the most granular view of the biological attrition at play.

It is crucial to remember that these figures are modeled estimates, not guarantees. Your individual medical history, ovarian reserve, and genetic factors play a significant role, meaning that all final decisions regarding your treatment belong with a qualified reproductive endocrinologist. The 19% downward adjustment required to make the Goldman model reflect the reality of frozen versus fresh eggs is a stark reminder that predictive models are imperfect tools. Use this data to understand the steep biological curves, set realistic targets, and prepare for the financial and physical realities of the process.