Age and Fertility — Evidence-Based Guide

Age changes natural conception odds and timelines. For your numbers, use the Fertility Calculator by Age first—then come back to this guide to understand what drives them and what to do next.

Fertility changes with age. This page gives you a quick, practical overview—plus tools to estimate your personal chances and plan next steps.


Pregnancy Chance Per Cycle

Enter your age to see an estimated chance of conceiving in a given cycle.

This quick model shows typical age trends. For a fuller picture (age + lifestyle + timing), use the Advanced Calculator.


How age impacts fertility

20s

  • Peak fertility: Highest egg number/quality; cycles usually regular.
  • Still matters: Sleep, nutrition, and timing can move the needle.

30–34

  • Gradual decline: Fewer high-quality eggs; conception still common.
  • Strategy: Track ovulation; address modifiable factors (weight, smoking, alcohol).

35–39

  • Noticeable drop: Egg quality declines faster; miscarriage risk rises with age.
  • Strategy: Tighten timing; consider a preconception consult if trying >6 months.

40+

  • Sharp reduction: Lower natural odds per cycle.
  • Strategy: Early specialist input; discuss options (IUI/IVF, donor eggs), optimize health.

Boost your chances at any age

  • Time intercourse in the fertile window (use the Ovulation Calculator).
  • Maintain a healthy weight, don’t smoke, and moderate alcohol.
  • Manage conditions (thyroid, PCOS) with your clinician.
  • Seek a fertility evaluation after 12 months <35 or 6 months ≥35.
Estimate your current pregnancy chances

Uses peer-reviewed data; adjustable for age, timing, and lifestyle.


FAQs

Does male age matter too?
Yes. Male fertility typically declines more gradually, but sperm quality and time-to-pregnancy can be affected after ~40. Our Advanced Calculator lets you include male age.
Can lifestyle changes offset age?
They can’t reverse egg aging, but improving sleep, weight, and smoking/alcohol patterns, plus precise timing, can raise your odds within your age group.
When should I see a specialist?
If you’re <35 and have tried for 12 months (or ≥35 for 6 months), or sooner if cycles are very irregular or there’s a known condition (e.g., endometriosis, thyroid).

Educational content only; not medical advice. Always consult a qualified clinician for personal guidance.

Last reviewed: