My uncle is a teacher, and I was shadowing him once. We went to his high school, and he introduced me to some of the staff. They were like, "oh, is he a potential student?"
I was 23
I was also still getting offered kids' menus in high school.
I am pretty small and look young. The goatee helps, but it's a matter of people thinking I'm like 2 years younger instead of like 5.
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http://i.imgur.com/VITyG.jpg