Age, egg quality, and timing of intercourse with viable sperm are major factors in determining a woman's fertility.

“But when trying to address how fertile a woman is, of course, age is going to be one of the major factors, but just one factor. We already talked about how age determines the likelihood of a successful pregnancy if the intercourse and ejaculation is being carried out at the correct times and with viable sperm capable of fertilizing eggs. And then, of course, there's the issue of egg quality.”