I had a couple of exchanges when DH and I went out to dinner on Saturday that I found really puzzling.
First, for a variety of reasons, a lot of the people who work as waitstaff where I live are in their late teens or early 20s. I am 27, and I'm pretty sure I look it.
At one point, I think when the waitress we had was getting me some lime for my diet coke, she said, "here you go, sweetie." It hurt my brain a little because, a) that's kind of a condescending way to address anyone who is older than about 5, and b) I'm almost positive that she was one of those servers in her early 20s. I know I don't look like a teenager, so at the very least, we were peers.
The other thing that I found really puzzling is that she asked my husband and I if we wanted separate checks or just one at the end of the meal. I can understand not wanting to assume anything about us, and I wouldn't expect her to have noticed that we were both wearing wedding rings, but it was kind of odd. We basically never get that question, because we look like a couple when we eat out. Even when we do get asked about the check, it's usually phrased more like, "Is this all one check?" rather than, "Do you want separate checks or is it together?"
It's a subtle thing, but it just reinforced the idea that she really seemed to think we were much younger than we were. Which hurt my brain because she was probably a good 5 years younger than me and a good 10 years younger than my husband!