We’re often told to have kids quickly, before our biological clock strikes and we fall off the fertility cliff. This week we find out it’s that’s true for women or men. And if the cliff is real, can you do anything about it, like freezing your eggs? Plus, the sperm-aggedon! We speak to epidemiologist Prof. Lauren Wise, reproductive endocrinologist Dr. Mary Sabatini, and andrologist Prof. Allan Pacey. Check out the full transcript here. Selected references:  Lauren’s two studies looking at the fertility cliff. Click here if you want to be in one of her studies!  Two studies looking at success rates of freezing eggs at different ages Review of the effect of paternal aging on the health of the offspringThe 2017 meta-analysis which shows the drop in sperm counts in several parts of the worldCredits: This episode was produced by Meryl Horn, with help from Wendy Zukerman, as well as Rose Rimler and Michelle Dang. Our senior producer is Kaitlyn Sawrey. We’re edited by Blythe Terrell. Fact checking by Diane Kelley. Editing help from Caitlin Kenney. Mix and sound design by Peter Leonard. Music by Peter Leonard, Emma Munger and Bobby Lord. Recording assistance from Mary Dooe and Andy Short. A huge thanks to all the scientists we got in touch with for this episode, including Dr. Richard Lea, Dr. Hagai Levine, Professor Jens Peter Ellekilde Bond, and others. And special thanks to everyone at Gimlet who listened to the episode, the Zukerman family, and Joseph Lavelle Wilson.