Year 30 ... or possibly when I was 5.
Five because it was pre-going-to-school, when life was just a constant playtime *sigh* no bills, no worries, Saturday morning cartoons that were awesome no matter how badly written and stupid (Hello, Superfriends).
But, at 30 I finally realized that I was an adult (I mean really an adult, not just the 'I can now drink legally!' kind of adult), which meant that I really didn't have to give two sh*ts anymore about what any one else thought about how I lived my own damned life. Wow, but that was a great revelation.
So, best years are either 1997 or 1972.