Yeah. As I'm sure you are born at age 1. The same way the 25th annual Wrestlemania was also it's 25th anniversary.How fucking ******ed are you? decades don't start at one. they start at 0. 1980 was not part of the seventies, 1990 was not part of the eighties and so on a so forth. My god pick up a book you imbecile.
http://dictionary.reference.com/browse/decade