Hand me that bottle of tequila and I'll show how 16 I really am...
  1. Can I see some ID?
  2. Are you old enough to drink?
  3. What year are you in high school?
  4. What schools are you applying to?
  5. What college are you thinking about going to?
  6. When do you graduate?
  7. Do you have an older sister?
  8. Which one of you is the older sister?
  9. Do you babysit?
  10. Would you want to go to a teen dance?
  11. How long have you had your license?
  12. Shouldn't you be in school?!
    When you're out and about during the week day. I used to have the same problem and I got this a few times, but the worst was...
    Suggested by @gwcoffey
  13. I just saw your mother last week!
    Uh, that was my wife.
    Suggested by @gwcoffey
  14. Are your parents home?
    I got this at age 28. From teenagers.
    Suggested by @allisonemiller
  15. "One adult, one child?" - movie ticket guy to me and my date before seeing Inside Out.
    Suggested by @MissBicks