What your fertility actually looks like at 40 — and what the statistics don't tell you

The statistics feel like a verdict. They're not.

The Question Underneath Every Other Question

It shows up on every fertility forum, in every late-night Reddit thread, in the messages I receive most often: am I too late?

Sometimes it's asked directly. More often it's buried inside another question — "my AMH is 0.6, what does that mean?", "I'm 42 and the clinic said my chances were low", "I should have started sooner, shouldn't I?" — but it's always the same question underneath.

The fertility industry answers this question badly. Clinics are in the business of offering treatment — not reassurance — and urgency makes you book quickly. The result is that over 40, you're likely to receive results framed as near-verdicts, when the evidence says something considerably more nuanced.

This collection of articles exists to give you the actual picture: what the tests measure, what they cannot predict, how to read the numbers clinics show you, and — crucially — what it means to be over 40 specifically, rather than just a patient with a low marker.

What You Actually Need to Know

There are a few things that change meaningfully once you're over 40, and almost no one explains them properly before your first consultation.

AMH does not predict whether you will conceive. It predicts how many eggs you're likely to produce in a stimulated cycle, and how close you are to menopause. That is all. There is no study that shows AMH can predict pregnancy outcomes — and yet it is routinely used to push you toward donor eggs, often before you've had a proper conversation about what the number actually means for your situation.

Over 40, egg quality matters more than egg quantity. The primary challenge is chromosomal competence — the proportion of eggs that are chromosomally normal falls with age, and no fertility test currently measures this directly. So a result that looks alarming in terms of volume may say very little about the quality of what's there. These are two different things, and they are frequently conflated.

Your number needs context, not just a comparison to a population average. A result that would genuinely concern a 32-year-old can be fairly unremarkable at 43. Age-adjusted context matters — and you should expect a clinic to provide it.

Other articles on this topic

What to Do Right Now

If you've just received results and you're trying to make sense of them, start with the AMH article — it's the most common entry point and covers the questions that come up most often at this stage.

If you're not yet sure where you are in this process — whether you're still deciding, already in treatment, or somewhere in between — the Find Your Starting Point tool gives you an honest picture in four questions.