Donor eggs after 49: what a study of 2,760 transfers found

Egg donation is one of the main reasons people travel for fertility care, and the reasoning behind it is sound: if egg quality declines with age, using eggs from a young donor should remove that variable. For most of the age range, that is broadly what happens.

New research presented at ESHRE in July examined where that logic starts to run out.

What the study found

Dr Beatrice Crestani and the IVIRMA Global Research Alliance analysed 2,760 single blastocyst transfers in 1,774 women who received donated eggs between March 2021 and December 2024.

Comparing recipients aged 35–40 against those aged 49 and over:

Outcome	Ages 35–40	Age 49+
Live birth per transfer	46.2%	31.7%
Clinical pregnancy	54.0%	42.6%
Miscarriage	24.2%	37.6%
Receptive endometrial pattern	94.7%	81.0%
Cumulative live birth (all embryos)	80.0%	62.5%

The eggs were equally young in both groups. What differed was the recipient — specifically, how her uterus responded. The drop in receptive endometrial pattern from 94.7% to 81.0% points to the lining itself as part of the explanation, which is why the authors describe this as uterine ageing.

The caveats matter here. This was a conference abstract, not yet peer-reviewed. It is a retrospective cohort from a single large commercial clinic network. And it cannot fully separate uterine ageing from the health conditions that accumulate with age. The author herself was explicit that the results should not discourage donor-egg treatment, since success rates at 49+ remain meaningful.

How to read this if you are over 45

The honest interpretation is neither of the two extremes you will encounter online.

It is not “donor eggs make age irrelevant.” That framing appears in a lot of clinic marketing and this study is a direct counterweight to it.

It is also not “there is no point after 49.” A 31.7% live birth rate per transfer, rising to 62.5% cumulatively across available embryos, is a real chance — considerably better, in fact, than what most people achieve with their own eggs in their early forties, where the UK regulator’s audited data shows 8% per embryo transferred at ages 43–44.

What it means practically is that the number to ask for is the one for your age band, in the donor-egg pathway specifically. A clinic’s overall donor-egg success rate is heavily weighted by younger recipients and will overstate your odds if you are approaching 50.

The questions to ask

If donor-egg treatment at an older age is your plan, these are worth raising directly with any clinic:

What is your live birth rate for donor-egg recipients in my age band? Not the programme average.

How do you prepare and assess the endometrium? Given that lining receptivity is where the difference showed up, how a clinic prepares and evaluates it is a substantive question, not a technicality. There is separate evidence that natural-cycle preparation outperforms hormone replacement for donor-egg recipients on both live birth and obstetric outcomes.

What is your upper age limit, and what is it based on? Clinics differ, and countries differ. Knowing whether a limit is a clinical judgement or a legal requirement helps you understand what you are being told.

What obstetric follow-up do you recommend? This is the part most easily lost when treatment happens in one country and pregnancy care in another. Donor-egg pregnancies carry a higher risk of hypertensive complications including preeclampsia, and that risk is independent of the age question. Whoever manages your pregnancy at home needs to know it was a donor-egg conception.

Why we are publishing this

It would be easier to write only the encouraging half. But a portal that tells you donor eggs erase age would be doing you the same disservice as marketing that quotes one big success number with no denominator.

The useful version is this: donor-egg IVF after 49 works meaningfully often, less often than it does at 40, and the gap is worth planning around rather than discovering afterwards.

If you want to see how treatment and follow-up fit together, read the patient journey.