Eh, age.
I love it when I realize that I have high school aged kids in my class and they weren't born until the 1990s!
I think I am cooler, smarter, happier, hotter and in better shape now at 35 than I have ever been in my entire life. (Well, I have definitely been hotter ... just wasn't smart or, actually, confident enough to realize it.)
Well, DCR was 5 when Wendy saw that concert...now I feel old!
Eh, only seven years younger. Seven years is nothing, unless you are married and then I'm told there's some itch involved or something.