Egg freezing is an increasingly popular reproductive technology that offers the potential of staying fertile later in life. Yet while it opens up possibilities of having children at a later age, promise of ‘rewinding the biological clock’ also encourages younger, presumably fertile, women to undergo infertility treatment. Dr Lucy van de Wiel will discuss how egg freezing profoundly shifts our understanding of what it means to be fertile, and to age. Dr van de Wiel is a Research Associate at the Reproductive Sociology Research Group.