I took Dizzle to gymnastics this afternoon and was asked this very question. The daughter of the owner came up to me after class and said, "Are you a mom?" To which I replied, "Yes, this is my baby (Doodle) and the little girl in the pink leotard (Dizzle) is my baby." She then got a stunned look on her face and said, "Really? I thought you were a teenager."
She continued to ask me questions, including, "Are you sure?" and "Are you married?" I just laughed, and took her comments as a complement. Perhaps I just look REALLY young for my age. Either way, this is not the first time I have been asked that question. I have on occasion been mistaken for a high school student (after I had already graduated college, might I add) and more than once I've been asked if I was the girls' nanny. In fact, a few months back, a gentleman came to the door to ask if we wanted our lawn aerated. I said, "No thank you." To which he replied, "Well, can I talk to your mom?"
Seriously, I didn't think I looked that young. I just have to remember that while I may get carded for the next decade or so ... at least when I am 40, everyone will think I'm 25. That's how it works, right?