Is this simply a sign of immaturity? Or could it be a sign of alcoholism?

When my friends and I were in our late teens and early 20s, we’d take pictures of ourselves partying and holding up bottles of booze with a “naughty naughty” cute pose. It was signalling “Wooo! We’re going to get trashed tonight!” or “Yeah, we’re underaged and rebellious!”

I have a friend or two on FB that are now in their mid 40s and still pose like this with booze. The also post stuff on the weekends like “Wooo! It’s a Jack Daniels kind of night!!” and “I was sooooooooooo drunk this weekend!”

Do you think this is more a sign of immaturity, or might they have a drinking problem? Or am I a prude and it’s totally fine to post stuff like this when you’re way more than old enough to drink without gettting carded.