I got my first Transformer (Gears, hence the avatar) in late spring of '84. I remember taking it in for show-and-tell at some point before summer vacation that year, which is how I at least have a rough approximation of the timeframe. I probably got it from my grandmother, because she used to love to buy me stuff like that. I was instantly hooked. Then over the summer for my eighth birthday, I added a yellow Cliffjumper, Bluestreak, and Sideswipe, along with a couple of GoBots, to my collection.
When the fall rolled around, one of the local TV stations started running GI Joe and Transformers in the hour before the network Saturday morning cartoon block, which they had advertised fairly profusely beforehand, so I knew it was coming. I was less interested in GI Joe, but you could bet that by 7:30 on a Saturday morning I would be parked in front of the TV with a bowl of cereal ready to watch my favorite cartoon robots.