My main character is upper teenage mentally so don't know how that would work out as she was artificially created so chronologically less than a lot of earth drinking ages. Fantasy settings often would have low drinking ages but she won't be one to drink and might just get water or something. As for Evvie, who I'll also be using as a higher mid tier, you don't want her to get drunk as she becomes even more...Evvie-like. She'll probably challenge everyone to a bar fight. Her fire breath mixed with alcohol could also be a problem.