At work I'm all the time asking "How old are you?" "Do you live by yourself/with your parents?" "Did I actually hear you're married?"
Apparently my coworkers assume I'm a 19-20yo sharing an apartment with a friend. My wedding band isn't invisible (at least not to me), and I didn't realize that dressed in our standard issue french blue shirt I look about 5 years younger than my actual age. Maybe I should keep a few to wear when I'm 40? Seriously, some people think I'm young enough to be surprised that I'm married. I think it's kind of funny.