Age and Fertility: At What Age Is It Considered “Difficult to Conceive” and Pregnancy Chances at Different Ages
Women’s fertility peaks between the ages of 20-29 and begins to decline rapidly after age 35 due to the natural decrease in the quantity and quality of eggs. Women at age 40 have only about a 5% chance of natural conception each menstrual cycle. Checking egg reserve (AMH) and consulting a specialist doctor are important options for those planning to have children in their late reproductive years.
Why Is “Age” the Main Factor in Difficulty Conceiving?
Medically, women are born with a limited number of eggs, and the body does not produce new eggs afterward.
- Puberty has about 300,000 – 500,000 eggs
- At age 37, the number of eggs decreases to less than 25,000
- Menopause means eggs are depleted from the ovaries
Besides quantity, the “quality of eggs and the chance of chromosomal abnormalities” in eggs also increase with age, making embryo implantation more difficult or increasing the risk of chromosomal abnormalities such as a higher chance of Down syndrome.
Comparison Table of Pregnancy Chances by Age Group
This data is based on international fertility statistics.
| Age Group | Chance of Pregnancy per Month (Natural) | Risk of Miscarriage |
|---|---|---|
| 20 – 29 years | 25% – 30% | Low (about 10%) |
| 30 – 34 years | 15% – 20% | Moderate (12% – 15%) |
| 35 – 39 years | 8% – 10% | High (20% – 30%) |
| 40 – 44 years | 1% – 5% | Very High (35% – 50%+) |
Warning Signs and How to Check Fertility
If you are over 35 years old and have tried naturally for more than 6 months without conceiving, it is recommended to see a doctor for the following tests:
- AMH Test (Anti-Müllerian Hormone) – a blood test to check the “remaining egg reserve” in the ovaries
- Ultrasound (Antral Follicle Count) – counting the number of antral follicles each month
- Semen Analysis – because men over 40-45 years old can also have reduced sperm quality
Options for Those Who Want to Have Children at an Older Age
- Egg Freezing – for women who are not ready now but want to preserve quality eggs for future use
- IVF/ICSI – in vitro fertilization to select the healthiest embryos
- Preimplantation Genetic Testing for Aneuploidy (PGT-A) – helps significantly reduce miscarriage rates in older mothers
Frequently Asked Questions
Q: Can a 40-year-old still conceive naturally?
A: Yes, but the chances are much lower (less than 5% per month) and there is a higher risk of chromosomal abnormalities in the embryo. It is advisable to consult a doctor for risk screening.
Q: Does older age in men really affect the ability to have children?
A: Yes, although men produce sperm throughout their lives, increased age causes more DNA damage in sperm, which affects the chances of conception and fetal development.
Q: What vitamins help improve egg quality?
A: Vitamin C, Vitamin E, Coenzyme Q10, Folic Acid, and Vitamin D help nourish egg cells but should be taken under medical advice.
