You know you're a grown-up (physically at least) when ...

you're telling your grandma about your plans to move into a new apartment and you mention that your new roommie is going to loan you her spare twin bed to use until you can get yourself a "real" bed.

She says, "Why isn't a twin bed a 'real' bed?"

And you restrain yourself from blurting out, "what if I want to have someone over?? You can't fit two people in a twin bed!*" Saying instead, "Well, the futon I've had for the past year and a half is a full, and I don't really feel like going back to a twin."

*Yes, I know. Anyone who had a relationship while living in a college dorm knows that it is, in fact, possible to fit two people in a twin bed. But I've been out of that scene for 6 years now, and I got rid of my post-college twin bed a year and a half ago now. I've come so far, and I don't want to take a step back ... Not to mention that I was a lot thinner back then, and my boyfriend was one of those stick people, thereby making it easy to fit the both of us in a twin bed.