It would have been the 1984-1986 timeframe, which puts me in my mid-20's.
I remember the Yellow Hall under the grandstands very well. That's where dealers like Charlie Ro had their stuff in those days. I even remember Mike Wolf having product to sell in his booth back then -- it wasn't just a display. And Clarke Dunham, one of the early custom layout builders (well-known for Citibank Station at the time), also had a booth in the Yellow Hall at the far end right near the exit to the small Gold Hall where Right-of-Way Industries had their big layout.
Oh how the landscape has changed!!!
David