The 80s. Even at my current age. Everything went in the 80s, and it was OK. From fashion to music, every couple months fads changed, resulting in it being OK to dress or listen to anything. Fantasy and Sci Fi were also anything goes. Looking back a lot of 80s stuff seems so ridiculous, but that's what made it so great. Same with gaming. New RPGs were being created everywhere, and since it was still a new hobby, the creativity was off the hook. Imagination ran supreme. When you didn't have access to all the information at your fingertips (internet), you came up with your own rulings and interpretations based on what you wanted; you didn't wait for some official tweet and did what they said. Nearly everyone homebrewed and created their own campaigns and adventures. And adventures weren't these huge slogs that took months; the vast majority were modules that were completed in a couple days at best and you could move on to different PC or different adventures before returning to the other campaigns.