As women "lean in" to their careers and other endeavors, some are waiting until later in life to marry and start families. But they can't wait forever, at least not if they plan on having children naturally, because Mother Nature has rules of her own when it comes to fertility.

I asked women over social media, "What's the age when you either started worrying, or think you'll have to start worrying, about being able to conceive, naturally?"

In other words: What is your "Scary Age?"

The results are displayed here in an interactive pie chart.