I Am Told I Don't Look My Age

I ran up to were I work to get some icecream for my family today on my day off and since they were so busy my manager told me to ring myself up even though we aren't supposed to and that I could go ahead and make it myself. He said, "You're not supposed to but since it's you, you can." I said it was because he loves me and a customer was watching us and asked if I was his wife😂 I nearly died and I can't wait to tease him about it tomorrow since he didn't hear her. He's a 32 year old married father of two and I only turn 18 next month lol. I guess I look older...