Some signs that you are growing up: 1  You think the music teenagers and college students are listening to is awful...Not nearly as awesome as the music that came out when you were a teen or a college student. 2  You like wine.3  You prefer well-cooked meals over fast food (at least sometimes). And when you hit bumps in the road, you actually try to work through it, rather than argue at the top of your lungs and end the relationship with drama. 2  You invest in a retirement fund. 3  You're officially a grown-up when you own stocks.