The first time I heard the word “adulting” not so long ago, I immediately harkened back to my pre-teen years and assumed the definition of the term was simply behaving like a grown-up. And if that was indeed the meaning of the latest, vaguely annoying, quasi-millennial recasting of long-held, perfectly fine words, then, yes, I definitely associated adulting activities as things we do in the fall. My (and Beyoncé’s) September 4 birthday always seemed to land on Labor Day weekend, the understood end of our endless summer. My summers growing up were filled with scant responsibilities, save playing competitive tennis…