My parents were non-drinkers into their 40s. After that, they had wine with dinner maybe 4-5 times a year. They both came from families who were teetotalers. Why? Because my grandparents on both sides came from families that were completely and utterly ravaged by alcoholism. So it was there, just three generations back.
And my aunt and uncle on my dad's side were both alcoholics, and I think I learned a lot of codependent behaviors from how my parents dealt with them (or, rather, DIDN'T deal with them…)