The chance of conceiving in any given month falls gradually with age, and the fall becomes steeper from the mid-thirties. That is a statement about large groups of people, and it cannot tell you what will happen to you. What it does change is practical: guidance suggests asking for help after six months of trying from around 35, rather than twelve. This is health information for planning, not a prediction about you and not a substitute for your own clinician.

If you are already worried, skip to the last section. Being told a number is rarely what helps.

What the figures actually describe

Population data describes how often conception happens per cycle across many people of a given age. Every one of those figures is an average over a group that includes people with conditions, people without, people trying carefully and people not.

ACOG describes both the number and the quality of eggs declining with age, gradually and then more quickly from the mid-thirties, and it describes this as a population pattern rather than a schedule anyone follows.

Two people the same age can be in very different positions, and nothing about a birthday tells you which one you are.

What changes, in plain terms

Eggs are not replaced. A person is born with all they will have, and both the number and the proportion that are chromosomally normal decline over time.

It can take longer. More cycles are often needed for the same result, which is exactly why the advice about when to seek help shortens rather than the advice about whether to try.

Some risks in pregnancy rise with age — including miscarriage and some chromosomal conditions — and antenatal care accounts for that. That is a conversation with a clinician, not a reason to change your plans on your own.

Age is one factor among several. Cycle regularity, conditions such as endometriosis or PCOS, previous surgery, smoking, and a partner's fertility all matter, and some of them are more changeable than age is.

The one thing this page will not do

It will not tell you your chances. Femio does not calculate a personal likelihood of conceiving, and no honest product can from the information an app holds.

A number attached to you would be a prediction about an individual made from group data — the same reason Femio shows a window rather than a date for a period, and refuses a verdict on a home temperature reading. What it can do is hold your cycles and your logs so a clinician who examines you has real information rather than recollection.

What actually changes with age: the timing of asking

This is the useful part, and it is concrete.

NICE's fertility guidance and ACOG both shorten the clock at around 35: six months of trying rather than twelve before an assessment is usually offered. Sooner still if your periods are irregular or absent, you have a known condition affecting the pelvis, or a partner has a known problem.

That is not a deadline. It is the point at which finding out becomes more useful than waiting, and what a fertility assessment involves describes what happens next.

Read when to seek fertility help for the wider set of reasons to ask early, at any age.

If you are planning rather than trying yet

A preconception appointment is worth more than a search result. It covers medicines, vaccinations, existing conditions, and anything worth sorting out before a pregnancy rather than during one.

Egg freezing and other options exist and are worth asking about directly if timing is a real concern for you. Success rates vary by age and by clinic, and a clinic quoting a rate should be asked what population it comes from.

Living with the number

There is a particular kind of pressure that comes from reading statistics about yourself at midnight, and it does not make anything more likely to work. If the figures have taken over, it is reasonable to stop reading them and take the question to a person.

Counselling is part of fertility care in many services and is not a sign that anything has gone wrong. The trying-to-conceive guide covers the day to day.

When to see a doctor

Contact your doctor after twelve months of trying, or six months from around 35, and sooner at any age if your periods are irregular or absent, you have pelvic pain, you have had pelvic surgery or an infection, or a partner has a known issue. Ask about a preconception appointment before you start if you have a condition or take regular medicine.

Ask for a referral rather than waiting to be offered one. The clock guidance uses starts when you started trying.

Frequently asked questions

Does fertility fall off a cliff at 35?

No. The decline is gradual and becomes steeper through the mid-to-late thirties. Thirty-five is where guidance changes, not where biology does something sudden.

Can a test tell me how long I have?

No test predicts that. Some tests describe aspects of ovarian reserve, and a clinician interprets them alongside everything else — none of them is a countdown.

Should I try for a year first if I am 38?

Guidance generally suggests six months at that age, and sooner if there is a known reason. You can always ask earlier.

Does age affect a male partner too?

Yes, more gradually. Both partners are assessed in any fertility work-up.

Can Femio estimate my chances?

No. It holds what your cycles have actually done so a clinician has real information, and it does not turn group statistics into a number about you.