Most women have roughly 100,000 to 150,000 eggs remaining by age 30. That number sits between the approximately 300,000 to 500,000 eggs present at puberty and the roughly 25,000 that remain by age 37. While 100,000+ sounds like a lot, only a fraction of those eggs are viable for fertilization in any given cycle, and the count drops steadily from here.
How Egg Count Changes Over a Lifetime
Your egg supply is at its peak before you’re even born. Around 20 weeks of fetal development, ovaries contain 6 to 7 million immature eggs. By birth, that number has already fallen to about 2 million. By puberty, it’s down to 300,000 to 500,000. This lifelong decline happens through a natural process called atresia, where immature eggs break down and get reabsorbed by the body. Of the millions you start with, only about 400 to 500 will ever be released during ovulation across your reproductive years.
The rate of loss isn’t constant. From puberty through the early 30s, the decline is relatively steady. Around age 32, the pace picks up. After 37, it accelerates sharply, dropping to roughly 25,000 eggs. By the time menopause arrives (around age 51 on average), roughly 1,000 eggs remain.
What This Means for Fertility at 30
Having 100,000+ eggs at 30 means your fertility is still strong, though it’s beginning a gradual decline. A woman in her early to mid-20s has a 25 to 30 percent chance of getting pregnant in any given month. In the early 30s, that monthly probability starts to dip slightly. The decline becomes more noticeable after 35.
Egg quantity is only part of the picture. Egg quality, meaning how likely an egg is to result in a healthy pregnancy, also decreases with age. Chromosomal abnormalities in eggs become more common over time, which is why miscarriage rates rise in the mid-to-late 30s and beyond. At 30, though, both quantity and quality are still in a favorable range for most women.
How Doctors Measure Your Egg Supply
There’s no test that counts your exact number of remaining eggs, but two common tests give a useful estimate of what’s called your “ovarian reserve.”
The first is AMH (anti-Müllerian hormone), a blood test. AMH is produced by the small follicles in your ovaries, so higher levels suggest more eggs in reserve. A typical AMH reading for a 30-year-old is around 2.5 ng/mL on the lower end, with many women measuring higher. Levels below this range may indicate a smaller-than-average reserve for your age.
The second is an antral follicle count (AFC), done via transvaginal ultrasound during the early part of your menstrual cycle. The technician counts the small, visible follicles (2mm or larger) across both ovaries. For a 30-year-old, the median count is about 19 to 20 follicles. The range is wide, though. Some women at 30 have fewer than 10, while others have more than 35, and all of these can fall within normal variation. A count well below 10 at age 30 would typically prompt further evaluation.
These tests are useful for assessing where you stand relative to your age, but neither one predicts exactly when you’ll have difficulty conceiving. A lower-than-average reserve doesn’t necessarily mean infertility, and a healthy reserve doesn’t guarantee easy conception.
Factors That Speed Up Egg Loss
While the overall trajectory of egg loss is genetically programmed, certain exposures and lifestyle factors can accelerate the decline. Smoking is one of the most well-established causes, but research has identified several others. Chronic exposure to environmental chemicals, including those found in certain plastics, pesticides, and industrial pollutants, is associated with reduced ovarian reserve and impaired follicle development. Air pollution (particularly fine particulate matter) has also been linked to lower antral follicle counts.
Occupational and psychological stress play a role too. Working long hours, handling heavy physical loads, and rotating shift work are all associated with lower ovarian reserve. Depression and chronic psychological stress show similar associations, likely through hormonal pathways that affect ovarian function. Interestingly, long-term use of hormonal contraceptives has been linked to temporarily lower AMH levels and reduced follicle counts, though this effect appears to reverse after stopping.
Egg Freezing at 30
For women who aren’t ready to conceive but want to preserve their options, age 30 is a strategically good time to freeze eggs. Both the European Society of Human Reproduction and the Nordic Fertility Society recommend freezing before 35 as the most cost-effective window, with the chance of a live birth from thawed eggs reaching up to 75 percent when done at younger ages.
The number of eggs retrieved matters significantly. Research shows that women under 35 who freeze 8 to 10 eggs have roughly a 30 to 45 percent cumulative chance of having a baby from those eggs. Freezing 15 eggs pushes success rates to around 70 percent, and banking 25 eggs brings the probability to approximately 95 percent. When fewer than 15 eggs are thawed, live birth rates drop to about 13 percent per patient, compared to 45 percent when 15 or more are available. Multiple retrieval cycles are sometimes needed to reach these numbers.
Freezing eggs at 30 rather than 35 or later generally means each retrieval cycle yields more eggs, the eggs themselves are of higher chromosomal quality, and fewer cycles are needed to bank enough for a strong chance of success.