By age 37, 90 percent of a woman's eggs are already gone. Professor Joyce Harper – reproductive scientist and former infertility patient – joins The Why Wait Agenda to talk about the trauma of treatment, the age that matters, and why feeling healthy isn't the same as being fertile.
Joyce Harper has dedicated her career to closing the fertility information gap. She teaches Reproductive Science at University College London's Institute for Women's Health, and is the co-founder of the UK Fertility Education Initiative and of the International Reproductive Health Education Collaboration. She is also the author of Your Fertile Years: What You Need to Know to Make Informed Choices (2021) and of Your Joyful Years: Empowering Good Health and Happiness Beyond 50 (2026).
Harper is not just a scientist; she has also been a patient. It took her seven years and IVF to have her first child at 39. «Those years of what I experienced, they leave their mark on you», Harper says. «That trauma will stay». She recalls the word that kept returning to her during treatment: «I thought, I'm barren. My body is not going to make a baby».
Eleonora Voltolina, journalist and founder of The Why Wait Agenda, met Joyce Harper in Paris, on the sidelines of the 2025 meeting of Eshre, the European Society of Human Reproduction and Embryology, to record this special episode.
Harper points to a specific age as a turning point for reproductive planning. «For most women, the really important time is around our mid-30s; that's when our fertility starts to decrease», she explains – not a cliff, but a gradual decline that accelerates sharply after 35. «So we've got to start preparing well before age 32».
Asked how to navigate fertility misinformation online, Harper recommends scientific societies over influencers: Eshre, the ASRM (American Society for Reproductive Medicine), the British Fertility Society, the HFEA (Human Fertilisation and Embryology Authority). «They're not selling anything», she says, «and are the reliable ones to go to».
Harper is also a fierce advocate for reproductive health education, including a topic young people rarely connect to fertility: sexually transmitted infections. Her message to young women today: «be aware of female fertility decline, no matter how young you feel».
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