Age and Fertility: Understanding Changes in Reproductive Potential
A compassionate, scientifically accurate look at age-related fertility changes and proactive reproductive planning.
Reviewed by Dr. Dileep Kumar H R, MBBS, DGO, DRM
October 2026 · Evidence-Based Healthcare
Reproductive biology follows a natural timeline. Women are born with their lifetime supply of eggs, which gradually decline in both number and chromosomal normality over time.
Peak fertility occurs in the 20s and early 30s. A more noticeable change begins around age 35, accelerating after age 37.
This change occurs because the meiotic spindle inside older oocytes is more susceptible to division errors, resulting in higher proportions of aneuploid eggs, lower implantation rates, and higher early pregnancy loss.
However, modern reproductive medicine offers effective proactive pathways — from individualized IVF protocols and blastocyst genetic testing (PGT-A) to social egg freezing in earlier reproductive years.
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Frequently Asked Questions
Preimplantation Genetic Testing for Aneuploidies (PGT-A) tests a few cells from a Day 5 blastocyst to identify chromosomally normal embryos before transfer, maximizing transfer success rates in women over 35.