Awww, don't be a Scrooge. I bet they have kids.
The people who live across from me have two boys, 6 and 7, and they started decorating last week. I thought it was really cute. It was 90 degrees, they had their swimsuits on, and they were putting up pumpkins and black cats.
I even snuck out in the yard and took some pics of them because they looked so sweet.
However, our mall and all the discount stores (Kmart, WalMart, etc) already have all their Christmas trees and decorations up, and I do think that's way too early.