Back in the late 60's and early 70's, my friend and I would stop and pick up a hitch Hiker and take him to the next town if he would go to the liquor store for us. We would give him the money, he would come out with the booze, we would drive him to the next town +/- 40 miles away.
The day I first arrived in California ( San Diego), on my cross country hitch, I went into a small store and bought myself some food and a cool beer to enjoy on the beach. Some teems on the street outside approached me to buy them some beer too. It was only then that I realized I was not old enough to be buying alcohol in CA!