---
title: "IVF success rate by age for women"
date: 2026-03-26
author: "HSFC Kenya"
featured_image: "https://hsfckenya.com/wp-content/uploads/2026/07/IVF-success-rate-by-age-for-women.png.webp"
categories:
  - name: "Male and Female Infertility"
    url: "/resource-library/articles/category/male-and-female-infertility.md"
  - name: "Treatments and Services"
    url: "/resource-library/articles/category/treatments-and-services.md"
---

# IVF success rate by age for women

While in vitro fertilisation (IVF) improves the likelihood of conception compared to natural methods, it does not guarantee success, and outcomes vary between individuals. IVF success rates are strongly influenced by age, with younger individuals having significantly higher chances of pregnancy and live birth. From IVF reviews, it is found that women under 35 have the highest success rates, around 40-50%, while the rates drop significantly for women over 40, often to below 10%. The decline is mainly due to the reduced quality and quantity of eggs.

Donor eggs can improve chances for older women, offering success rates of 70-80%. Other factors, like [embryo quality](https://hsfckenya.com/resource-library/articles/treatments-and-services/ivf-embryo-grading-and-success-rate/), also influence outcomes. Age-related pregnancy risks, like miscarriage, are higher for women in their 40s.

[IVF](https://hsfckenya.com/treatments/in-vitro-fertilisation-ivf/) success is typically measured by live birth rate per cycle or embryo transfer. With genetically normal embryos, success can reach ~60 to 65% per transfer. However, overall success declines with age, especially when using a woman’s own eggs.

**Why Age Matters**

Age is the most important factor affecting IVF outcomes because egg quality declines over time, and chromosomal abnormalities (aneuploidy) increase with age. This leads to:

- Lower fertilisation rates
- Poorer embryo quality
- Higher miscarriage risk

**Success Rates by Age (Using Own Eggs)**:

Fertility decline becomes more noticeable in the mid-to-late 30s and drops significantly after 40:

- Women under 35: First embryo transfer; 41.4% live birth rate. Subsequent transfers; about 47% due to better embryo quality and implantation potential.
- Women 36-37: Initial transfer; 31.6% success. Subsequent transfers; 44.7% live births. Still good chances with appropriate treatment
- Women 38-40: Live birth rate drops to 26.8%. Subsequent transfers have better chances at 40.9%. Reduced egg quantity and quality impact outcomes
- Women over 40: Success rate decreases significantly to around 7%. Higher miscarriage risk and fewer viable embryos.

**Why Success Declines with Age**

- Reduced ovarian reserve: fewer eggs available for retrieval
- Poorer egg and embryo quality: higher chance of abnormal embryos
- Higher miscarriage rates 
    - ~20% at age 35
    - ~40% at age 40
    - Up to ~80% by age 45

**Donor Egg IVF**

Because eggs come from younger donors, success rates are much higher and less dependent on recipient age. The success rates are often around 45–55% per transfer.

**Frozen Embryo Transfer (FET)**

[FET success](https://hsfckenya.com/resource-library/articles/infertility/evaluatingfrozenembryotransfersuccessrates/) also declines with age. Younger patients have better outcomes, and success depends on embryo quality, egg quality and the uterine environment.

**Other Factors Affecting IVF Success**

Beyond age, several factors influence outcomes:

- Embryo quality (key predictor)
- Number and quality of eggs retrieved
- [Ovarian reserve](https://hsfckenya.com/resource-library/articles/female-fertility/what-is-an-amh-test/)
- Clinic expertise and lab quality
- Lifestyle factors (smoking, alcohol, stress)

**Role of Multiple IVF Cycles**

- Many patients require 2–3 cycles to achieve pregnancy
- Success rates can increase cumulatively with repeated cycles
- Some evidence suggests continued improvement up to several attempts

**Important Considerations**

- IVF statistics are averages, not guarantees
- Individual outcomes vary based on biology and health
- Clinics may report success differently (per cycle vs per transfer)
- Professional guidance is essential when interpreting results

**Key Takeaway**

IVF success is highly age-dependent, with the best outcomes under 35 and a sharp decline after 40. However, options like donor eggs and multiple cycles can significantly improve the chances of pregnancy.

Read more about age-related success rates for IVF in this [blog](https://ifg-ivf.com/blog/ivf-success-rates-by-age-what-are-the-actual-odds-of-getting-pregnant.html) from the International Fertility Group.