I can’t remember when I saw Star Wars for the first time… I’ve just known it and loved it all my life (I was born in '77). My earliest memory is of my dad recording Star Wars for me off of First Choice Super Channel (now The Movie Network), when it aired on TV for the first time in February of '83. I would have been 5 at the time, but already knew Star Wars well enough that I was over the moon at the prospect of actually owning a copy of the movie (I guess my parents must have rented it from the video store pretty regularly until then). I actually still have a copy of that VHS cassette.
As for ESB, I don’t think I actually saw the movie at the theatre, but I remember my dad and uncle coming back from the movie and debating whether or not Vader was really Luke’s father.
But I do distinctly remember seeing ROTJ in the theatre while on vacation in '83… good times.