I met some girls out on the weekend while my friends all walked off on me in different directions for a while (I'm carrying a back injury so it was easier to leave me behind) so I start talking and they told me they thought they were older then me and they were 20. At least drinking age is 18 here so I only get carded 2 thirds of the time now instead of every week, when I was 20 I once had to prove my ID was real by comparing the signature. It's good when ppl think you're still a student though and you get a discount, hahaha.
