ten year what?

I told someone yesterday that the longest I've gone without moving since graduating high school is about 2 years. And I think that was the first two years when I was still at home going to WCC. It's been almost 10 years since graduation. The other day while driving past my high school I saw a few banners for reunions and then went into shock when I saw my year up there. Well not really shock, I knew 10 years was coming up, but it was still kind of a weird feeling to see it.