You know you're a grown-up when, when your car is getting some regular maintenance done and you don't want to sit in the waiting room for two hours, rather than walking half a mile to the mall to kill some time, you walk a mile to Home Depot.
You know you're a grown-up when you look forward all day to the squash you're going to have for dinner (and it's not even covered in butter and brown sugar!).
You know you're a grown-up when you've been racking your brain for ideas to put on your Christmas list, and the best you can come up with is a new frying pan.
You know you're a grown-up when a day off work means you can finally go get that flu-shot you've been meaning to get.
You know you're a grown-up when the best time of day is bedtime.
Speaking of which...
7 years ago