Introduction
More and more women are pursuing IVF after age 40 — because they found a partner later in life, due to career, earlier health circumstances, or simply because natural conception was enough until then. The internet is full of both overly optimistic and overly frightening articles on this topic.
In this article, we present realistic numbers based on data from relevant IVF registries, and explain what actually determines the chances of success after 40.
Why fertility declines with age
- Ovarian reserve (the number of remaining eggs) naturally declines over a lifetime, accelerating after age 35
- Egg quality also declines — with age, the proportion of eggs with chromosomal errors (aneuploidy) increases
- According to ASRM data, among women aged 35 to 40, as many as roughly 64% of embryos carry some chromosomal abnormality, compared to about 52% in women under 35
- This is the main reason why the risk of miscarriage rises with age, while the chance of obtaining an embryo capable of implanting declines
Chances of success by age (using your own eggs)
According to data from the U.S. SART registry — one of the largest and most transparent IVF registries in the world — the live birth rate per started cycle (from egg retrieval) looks like this:
- Under 35: around 43%
- 35–37: around 31%
- 38–40: around 19%
- 41–42: around 9%
- Over 42: around 3% or less
Note: European registries, such as ESHRE, show a similar declining trend, although exact figures vary from country to country and clinic to clinic.
What these numbers mean in practice
- These are national averages, not an individual forecast — two women of the same age can have completely different ovarian reserves and different chances
- When a genetically normal (euploid) embryo is transferred, the chance of success is similar for younger and older women — the biggest issue after 40 isn’t the uterus, but the proportion of genetically normal eggs/embryos
- This is why PGT-A testing (genetic testing of embryos before transfer) is increasingly part of the strategy for women over 38–40 — it doesn’t increase the number of eggs, but it helps select the embryo with the highest chance of success
Cumulative chance after multiple attempts
A single cycle rarely tells the full story. Studies tracking cumulative chances after multiple cycles over two years show significantly higher numbers:
- Age 40: around 56%
- Age 41: around 39%
- Age 42: around 31%
- Age 43: around 19%
- Age 44: around 11%
- Age 45: around 4%
- Over 46: close to 0%
This reflects one representative study, not a universal standard, but it illustrates the principle well: more cycles genuinely increase the overall chance, especially up to age 43, while after 44–45, additional attempts using one’s own eggs yield increasingly less. This is worth keeping in mind both financially and emotionally when planning the number of attempts.
When to consider egg donation
For many women after 43–44, or earlier if ovarian reserve is significantly diminished, egg donation becomes a realistic and often recommended option — not because it isn’t worth trying with one’s own eggs, but because the chance of success with donor eggs depends primarily on the donor’s age (typically 20–30), not the recipient’s age. This is why the success rate with donor eggs in women over 40 still runs at around 50% per cycle.
Note: we’ve written a separate article about the egg donation process, donor selection, and prices by country, which you can read HERE.
What you can realistically do
- Complete diagnostics before starting (AMH, AFC, hormonal status, overall health) — this gives a more accurate picture than age alone
- Talk to your clinic about a realistic strategy: how many cycles to plan, whether to include PGT-A, when to consider donation
- Pay attention to lifestyle factors (weight, smoking, alcohol) — they can’t “make eggs younger,” but they can improve overall conditions for pregnancy
- Prepare emotionally and financially for the possibility that more than one attempt may be needed
- Don’t rely solely on generic percentages from the internet — your personal prognosis depends on your own test results, not on averages
Conclusion
Age is an important factor in IVF, but it isn’t the only one, and there’s no single answer that applies to all women over 40. A realistic assessment requires insight into your personal ovarian reserve, overall health, and treatment history, not just your calendar age.
If you’re thinking about IVF after 40, our team can help you understand your test results, set realistic expectations, and decide which strategy: using your own eggs or donor eggs is best for your situation and connect you with the right clinic in your country of residence of abroad.
Book you initial consultation HERE.
