Isn't She a Bit Young to Be Married?

...is what I thought about a girl I saw at church yesterday. (Her left arm was on the back of the chair around her husband, and I couldn't help but notice the ring.) But then I had the thought: maybe I am just getting too old to be single. I've bitched and moaned about being single before, but it's never popped into my mind worded like that. What does it mean? I dunno...