I'm 23 and have never tried alcohol. My brother was, and my dad is a high-functioning alcoholic, and my mom has her own struggles with it. I don't know if I technically fall under the medical definition of an addictive personality, but if I for example eat junk food one day, I have the craving stronger the next day than if I were to go a week without junk food. All of this makes me never want to start drinking. I salute anyone who has quit drinking, but respect anyone's choice to drink