Oh, I have TONS of stories on this one, but I'll try to keep it short.
I'm 26.
I was home on break from school when I was about 19 and went out with my mom. This lady she wanted to see about something she was thinking of buying asked if I was having a good day with my grandmother (who had recently passed away). I said no, but that I was having a nice time with my mother. She then decided to ask my age and almost fell over when I told her. She thought I was 12.
When my husband and I got married (Jan. 2001), we had to take my son to his grandparents', which is about 400 miles from where we live. They are in a really conservative town not far from Amish country. The next morning, we went out to breakfast, and I noticed a lot of people staring at us because we were holding hands. They thought I was his daughter. I'm sure we were the topic of conversation for at least the rest of that day.
A week or so ago, there was a knock on the door. We have a volunteer fire dept. and they were asking for donations. When I answered the door, the guy on the other side asked to speak to the lady of the house.