I have son(s) your age and the bars are fairly lax if you look older. Oldest son looked 18 no problem when he was younger and never got asked. Second son looked younger than his actual years and did get asked many times in some of the bars. He got around that....use your imagination
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In the casino, same rules apply as it does depend on how old you look. The problem at the casino would probably be if you won some big money and they asked you for ID.