I don’t think you become a grown-up.
I think it’s something you feel. And as time goes on and the years go by, it’s something you begin to feel more often than not.
And sometimes you feel grown-up not because it’s your birthday and you know you’re another year older, but on a Thursday afternoon as you leave for work.
And maybe it’s because you’re finally learning how to dress appropriately for the weather, or because you’ve spent the past hour running errands. Hell, maybe it’s because of the sound your boots make.
Or maybe it’s because you really feel happy and together, and it’s something you’ve been feeling more and more.