Thanks to reminders from interfering relatives and Hollywood movies, we women are all too aware our baby-making years are numbered. But would you want to be repeatedly reminded how long you've got left right down to the last second?
Visual artist Mira Kaddoura does and she's happy for the whole world to know, too. Kaddoura has created The Wonder Clock a website and smartphone app that counts down to the end of her fertile years.
"The Wonder Clock is a conceptual, interactive art project that counts down my biological clock," she told Forbes.
"I created The Wonder Clock because we live in societies where women are still to a certain degree defined by their biological clocks," Kaddoura said.
"There is so much fear and anxiety around this topic. The Wonder Clock confronts the question, 'How much time do I have left?' head on, allowing women everywhere to face their fears about this taboo subject, as well as giving them a forum to share their views and feelings with other women," she explained.
While websites that analyse our fertility window are hardly new, The Wonder Clock was designed to be more unnerving.
"I am taking something very personal and intimate and making it very public. That will make some people uncomfortable," she said.
You can say that again. Even if Kaddoura is merely making a statement and not suggesting we take the app seriously, women whose fertility windows are a touchy subject probably won't be The Wonder Clock's biggest fans.
Is The Wonder Clock a useful tool, or does it only add to the pressure and insecurity many women feel regarding their limited time to produce spawn?