Jean Smith

The optimal age to freeze eggs is 19.

By Jean Smith.

Published on February 8, 2026.

If you're a woman interested in preserving your fertility window beyond its natural close in your late 30s, egg freezing is one of your best options.

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The female reproductive system is one of the fastest aging parts of human biology.

But it turns out, not all parts of it age at the same rate.

The eggs, not the uterus, are what age at an accelerated rate.

Freezing eggs can extend a woman's fertility window by well over a decade, allowing a woman to give birth into her 50s.

In fact, the oldest woman to give birth was a mother in India using donor eggs who became pregnant at age 74.

In a world where more and more women are choosing to delay childbirth to pursue careers or to wait for the right partner, egg freezing is really the only tool we have to enable these women to have the career and the family they want.

Given that this intervention can nearly double the fertility window of most women, it's rather surprising just how little fanfare there is about it and how narrow the set of circumstances are under which it is recommended.

Standard practice in the fertility industry is to wait until a woman reaches her mid to late 30s, at which point if she isn't on track to have all the children she wants, it's advised she freeze her eggs.

This is not good practice.

The outcomes from egg freezing decline in a nearly linear fashion with age, and conventional advice does a great misservice to women by not encouraging them to freeze eggs until it's almost too late.

The optimal age to freeze eggs varies depending on the source and metric, but almost all sources agree it's sometime between 19 and 26.

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So why has the fertility industry decided to make freeze your eggs in your mid-30s the standard advice as opposed to freeze your eggs in your sophomore year of college?

Part of the reason is fairly obvious.