Last week, I had a new patient visit who apologised before she’d even sat down. Thirty-eight, a good job she loved, a partner she’d found a little later than she’d planned, and she opened with ‘Sorry, I know I’ve left it too late, and I don’t want to waste your time.’
I hear that sentence, or some version of it, most weeks. It usually arrives wrapped in shame, as though the years were a thing she’d squandered rather than just lived. So I want to start where I started with her. Age is information. It is not a verdict.
What it is, is one of the most useful things you can bring to a first conversation about your fertility. Because once we know where you are, we can talk honestly about your options. And you almost always have more of them than you think.
Let’s not soften the biology, because you’re capable of handling it and you’ve probably been handed half-truths already.
Female fertility does decline with age, and it declines for a reason worth understanding. You were born with every egg you’ll ever have. There’s no resupply. Across your life that pool of follicles steadily shrinks, and the eggs that remain are, on average, more likely to carry chromosomal errors as the years go on. That’s the engine behind the numbers.
And the numbers are real. A healthy 30-year-old has roughly a 20% chance of conceiving in any given cycle. By around 40, that per-cycle figure sits closer to 5%. The decline is gentle through your twenties and early thirties, then steepens noticeably after about 35, and again after 38. None of that is me catastrophising. It’s the consistent picture across ASRM, ACOG and the research base, and it’s the reason fertility specialists pay attention to age at all.
Here’s what those figures don’t mean. They don’t mean a 5% monthly chance is zero. They don’t mean 38 is a closed door. They describe averages across populations, and you are not an average. You are a specific person with a specific body, and the only way to know what your fertility looks like is to investigate it rather than guess from a birthday.
This is where a lot of women get frightened by a single number, so let me untangle it.
When we talk about ovarian reserve, we’re talking about egg quantity, the approximate size of the follicle pool you have left. We estimate it with two main factors: an AMH blood test (anti-Müllerian hormone, produced by the small follicles in your ovaries) and an antral follicle count, which is an ultrasound that counts the visible follicles at the start of a cycle. Together they give us a sense of how many eggs you have and, importantly, how your ovaries are likely to respond if we ever needed to stimulate them.
What AMH does not tell us is egg quality. It is not a count of your eggs, and it is not a fertility score you pass or fail.
I’ve sat across from women in their early thirties with a lower AMH than they expected who conceived without any help at all, and women with a reassuring AMH who needed more support. The variation between two women of the same age can be enormous. A 35-year-old in the top tier of her age group can have the reserve of an average 25-year-old.
Quality, the genetic competence of the eggs themselves, is the part most tied to age and the part we can’t measure with a simple blood test. That’s the honest limit of what testing can see, and I’d rather you know it than be sold false certainty in either direction.
One more thing I won’t let slide, because it’s missed constantly. Fertility is not a women’s issue with a male footnote. Male factor contributes to up to around half of the difficulty couples have conceiving. If a woman walks in carrying all the worry about her age while her partner has never had a semen analysis, we are investigating with one eye closed.
So when a couple comes in, we investigate both partners together from the outset. A semen analysis is simple, it’s quick, and it changes the plan more often than people expect. Your age is worth understanding. So is everything else in the room.
If you’re reading this and doing the maths on your own age, here’s the practical heart of it.
Coming in earlier almost always means more options on the table. That’s not a sales pitch, it’s arithmetic. At 34 we might have the luxury of watchful waiting, a few cycles of trying with timed support, room to be unhurried. At 39 that same conversation has a different shape, and the choices we can offer narrow with each year that the decision sits unmade. Waiting feels like the cautious option. Often it’s the opposite.
That cuts both ways, and I mean this as relief, not pressure. If you’re 31 and anxious because the internet told you 35 is a cliff, you very likely have more time than the panic suggests. If you’re 41 and have been told not to bother, that’s also usually too blunt to be true. The point of investigating isn’t to deliver a sentence. It’s to replace a vague dread with an actual picture, so you can make decisions that are yours.
Blindly hoping it’ll work out isn’t a plan. Knowing where you stand is. And whatever your age turns out to mean for you, you’re far better off making choices from information than from a number you’re afraid to look at.
If you’re somewhere in this and not sure what your own picture looks like, I’d be glad to help you find out. Come and have the conversation. We can work out what’s actually true for you, and go from there.
Male factor affects around half of couples trying to conceive, yet the man is often the last to be tested. Dr Maree Lee explains what a semen analysis really tells you and why both partners should be investigated from the start.
Age is information, not a verdict. Dr Maree Lee explains what fertility decline after 35 really means, why AMH doesn’t tell the whole story, and when to investigate.
An evidence-based guide to elective egg freezing by fertility specialist Dr Maree Lee: what it preserves, success rates by age, the process and the Australian rules.
