I think this qualify
Kelsey Grammer Engaged to Kayte Walsh - Celebrity Circuit - CBS News
seriously 26 years difference, but I guess whatever make them happy.
my wife makes fun of me and we are only 7 years apart. (usually when I talk with my friends about days in our High school and she goes, you know how I was when you were in high school? and I keep going, we dated when you were 20... so it doesn't count! )