How much does fertility decline as a woman gets older?

Female fertility declines after age 35. You may conceive easily, or it may be difficult. Unfortunately it is not easy to predict.
Without pushing the envelope too far, what is the longest a woman can wait without missing her opportunity to become pregnant? Fertility starts to decline in the early thirties, which is why a 30-year-old has roughly a 20% chance of conceiving in any given month, but by 40, there is only about a 5% chance.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.