How Your Age Affects IVF Success, and What You Can Do About It

One of the most common questions when thinking about IVF is, “Does my age impact my chances of success?”

Yes. Age is a major factor in female fertility and success of IVF, especially with a woman’s own eggs. But age is only part of the story. Other factors that can affect the outcome include ovarian reserve, the health of the eggs and sperm, reproductive history, embryo quality, medical conditions and the fertility treatment itself.

The American Society for Reproductive Medicine (ASRM) states that a woman’s age is one of the most significant factors in determining her reproductive potential. Fertility tends to decrease with age, with a steeper decline occurring after the mid-30s.

Understanding the relationship between age and IVF success can help you make informed decisions about when to seek advice, whether fertility preservation may be appropriate and which treatment options to discuss with your fertility specialist.

Why Does Age Matter in IVF?

The reason age matters is because as you get older, the quantity and quality of eggs slowly declines.

Women are born with a finite number of eggs, and as women get older, the quantity and quality of eggs decrease. Older women are more likely to have chromosomal abnormalities in their eggs. It can affect fertilisation, embryo development, implantation and risk of miscarriage.

IVF can help with some of the steps of conception, but it can’t fully erase the biological effects of ageing on eggs.

This is why IVF success rates with a woman’s own eggs go down as the age goes up. CDC data also indicate live-birth outcomes from embryo transfers using a patient’s own eggs tend to decrease with age.

How IVF Success Changes With Age

There is no single IVF success rate that applies to everyone.

Success rates can vary depending on:

• Age
• Egg and embryo quality
• Ovarian reserve
• Sperm quality
• Cause of infertility
• Previous IVF attempts
• Number of embryos available
• Uterine health
• Clinic and laboratory factors
• Whether own or donor eggs are used

For example, CDC's 2022 U.S. data show that live-birth rates following embryo transfer using a patient's own eggs generally declined with age, while outcomes using donor eggs or embryos were comparatively stable across recipient ages.

These figures are population averages, however. They should not be interpreted as an individual's personal probability of success. The CDC specifically advises patients to discuss their individual circumstances with their healthcare provider.

Age and Egg Quality

Egg quantity and egg quality are two different things.

Ovarian reserve tests such as AMH and antral follicle count can provide information on the number of follicles available and how the ovaries might respond to stimulation. But these tests do not directly assess the quality of the eggs.

Age is a better predictor of reproductive success than ovarian reserve testing alone.

As women get older, the chance of chromosomal abnormalities in eggs increases. This can reduce the chances of a normal embryo developing and can increase the chances of miscarriage.

This is part of why IVF outcomes can change with age even when ovarian reserve appears to be relatively good.

Does Age Affect Embryo Quality?

Age can influence embryo development because embryos inherit genetic material from both the egg and sperm.

The age of the woman providing the egg is particularly important because the likelihood of chromosomal abnormalities in eggs increases with age.

However, embryo development also depends on sperm quality, laboratory conditions and other biological factors.

If embryos are created through IVF, specialists may evaluate their development and discuss whether additional testing is appropriate based on the individual's circumstances.

It is important to remember that no fertility test or treatment can guarantee a successful pregnancy or live birth.

IVF Success in Your 20s and Early 30s

Younger age is generally associated with better reproductive potential, although infertility can occur at any age.

Women in their 20s and early 30s may have a greater likelihood of producing eggs with normal chromosome numbers compared with older age groups. This can contribute to better IVF outcomes when using their own eggs.

However, age alone does not guarantee IVF success.

Conditions such as endometriosis, tubal disease, ovulation disorders, male-factor infertility and other medical issues can affect fertility regardless of age.

A personalized fertility assessment is therefore important even for younger patients.

IVF Success After 35

Fertility does not suddenly stop at age 35. However, the chances of conception and live birth generally decline with increasing age, and the decline becomes more significant during the later reproductive years.

ASRM notes that pregnancy and live-birth chances decrease after 35 while the risks of aneuploidy and miscarriage increase.

For someone considering IVF after 35, it can be useful to avoid unnecessary delays and seek professional guidance early.

Your fertility specialist may assess ovarian reserve, reproductive anatomy, sperm parameters and other factors before recommending an appropriate treatment approach.

IVF Success After 40

IVF after 40 is possible, but treatment can become more challenging when using a woman's own eggs.

CDC data demonstrate a continuing decline in live-birth rates with increasing age among embryo transfers using patient eggs. In the 2022 U.S. data, the reported live-birth rate per embryo transfer was 31.6% at age 40, 24.6% at 42, and 13.8% at 45 for patient eggs or embryos. These are national averages and do not represent an individual's personal chance of success.

Because fertility declines more rapidly in the 40s, seeking an evaluation sooner rather than later can be important.

Depending on the individual's circumstances, a specialist may discuss IVF using own eggs, fertility preservation, donor eggs or other reproductive options.

What Can You Do to Improve Your IVF Chances?

Age itself cannot be reversed, but there are steps you can take to make your fertility journey more informed and potentially address factors that can be modified.

1. Seek Fertility Advice at the Right Time

Don't wait unnecessarily if you have concerns about fertility.

ASRM recommends infertility evaluation after 12 months of trying for women under 35 and after 6 months for women aged 35 or older. For women over 40, more immediate evaluation may be appropriate. Earlier evaluation is recommended when there is a known condition associated with infertility.

2. Understand Your Ovarian Reserve

Tests such as AMH and antral follicle count can help your fertility specialist estimate ovarian response to stimulation.

However, these tests should be interpreted alongside age and the rest of your medical history rather than being treated as a standalone prediction of pregnancy.

3. Maintain a Healthy Lifestyle

A healthy lifestyle supports overall health during fertility treatment.

Avoid smoking, maintain a healthy weight, stay physically active and follow a balanced diet. Excessive alcohol and recreational drug use should be avoided when trying to conceive.

Lifestyle improvements cannot reverse age-related changes in egg quality, but they can support general health and pregnancy preparation.

4. Address Medical Conditions

Conditions such as endometriosis, fibroids, thyroid disorders, diabetes and other health problems may affect fertility or pregnancy.

Managing relevant conditions before treatment can help your medical team create a more appropriate treatment plan.

5. Evaluate Both Partners

Fertility involves both partners.

A comprehensive evaluation may include assessment of ovulation, reproductive anatomy and semen parameters. ASRM recommends that male-factor evaluation be considered alongside female fertility assessment.

Egg Freezing and Age

For people who are not ready to have children but want to preserve reproductive options, egg freezing may be discussed.

Age at the time of egg freezing matters because younger eggs are generally more likely to have better reproductive potential.

However, egg freezing does not guarantee a future pregnancy.

The decision should be based on individual reproductive plans, age and medical circumstances rather than relying only on ovarian reserve test results. ASRM notes that age is a stronger predictor of reproductive success than ovarian reserve markers alone when considering planned egg freezing.

Donor Eggs and IVF Success

For some patients, donor eggs may be an option when age-related decline in egg quality significantly affects treatment prospects.

CDC data show that live-birth outcomes using donor eggs or embryos are less closely associated with the recipient's age than outcomes using the patient's own eggs.

Whether donor eggs are appropriate is a deeply personal and medical decision that should be discussed with a qualified fertility specialist.

How to Prepare for IVF at Any Age

Regardless of age, preparation can help you approach IVF with realistic expectations.

Before starting treatment, consider discussing:

• Your ovarian reserve
• Previous fertility history
• Semen analysis
• Uterine and tubal health
• Potential treatment protocols
• Number of eggs expected
• Embryo development
• Whether genetic testing may be appropriate
• Expected success rates for your specific circumstances
• Alternative treatment options

It is also important to understand how a clinic reports success rates.

A clinic's published success rate does not necessarily represent your personal chance of having a baby. The CDC cautions that clinic comparisons can be misleading because patient populations, treatment methods and other factors can differ between clinics.

Conclusion

Age is an important factor in In vitro fertilization (IVF) success, particularly when treatment involves a woman's own eggs. As age increases, changes in egg quality and chromosome-related abnormalities can make conception and successful pregnancy more difficult.

However, age is not the only factor that matters.

A thorough fertility evaluation can help identify other factors that may influence treatment and allow your fertility specialist to create a personalised plan.

If you are considering IVF, don't rely solely on general success-rate statistics found online. Your age, ovarian reserve, reproductive history, sperm health and treatment approach all contribute to your individual situation.

Most importantly, seeking fertility advice at the right time can help you understand your options and make decisions based on your personal reproductive goals.