How long can menopause be delayed? Model developed by mathematician points to answers

At birth, ovaries in girls can contain about a million tiny structures called primordial follicles, each of which contains an egg cell. As girls grow and experience adulthood, most of these follicles will die while only one follicle will survive each month to ovulate a mature egg. When the loss of primordial follicles is nearly complete, and only hundreds remain, women experience menopause, a time when menstrual cycles have ceased for 12 months.