Hmm. There's a couple of ways I could answer this.
The 60s were an incredibly vibrant time. The cultural revolution was in full swing and that was evident in just about every aspect of popular culture. Civil Rights, Women's Lib, and the Sexual Revolution informed just about everything. Add that to things like the Apollo Program and it seemed like the world was on the verge of bursting into the future. Never before or since has there been a decade like that.
On a more personal level, there was the 70s, when I was a teenager. Good times. Culture was still vibrant, the music and comics and TV shows were diverse and creative (until the last couple of years of the decade, anyway), and, best of all, I started going out with girls.

Also, I started to hit my stride on a creative level and learned the more technical aspects of writing.
On the other hand, the early 80s were pretty good. There was a bit of a rebound from the pop culture collapse of 1978. Punk and New Wave brought new life to music for a while, the direct market brought new life to comics for a while, and there was a lot of interesting stuff going on in movies and genre literature. And I was out of high school, traveling around a lot, and having more sex than before or since. Unfortunately, that all petered out by the mid 80s, so I guess it only counts as a half decade.