I was invited to join a friend to go to Gordon's for thanksgiving in '98.  Didn't go back until I had my own shit a couple years laterG
The real question is when did you take YOU to G for the first time?  Not when your parents/family went and drug you along.  But, when you packed your own truck, with your own ride, with a cooler full of what it would take to to survive a weekend. 
When did YOU go to G for the first time?
Me?  Probably '00~01.  Had my TRX250R in the bed of my '72 Chevy pick-up, 20 gallons of pre-mix fuel, handful of deli meat packets, loaf of bread, bottle of mustard, and a mountain of beer.  LETS'S F**KIN' GO!!