My Dad took me to see Star Wars at a theater in California some time in 1977, but I was not even three years old at the time and although he tells me now that I really enjoyed it, I don't remember it at all. The weird thing is he also took me to a drive in Theater in '77 for a double bill: Herbie goes to Monte Carlo and James Bond in The Spy Who Loved Me, and I do remember being there for both of those. The first time I remember watching Star Wars was October 1982 when it aired in the U.K. on ITV. By then I was almost 8 years old, and I've been a fan ever since.
I saw The Empire Strikes Back for the first time on Betamax in 1984 at a friends house, and Return of the Jedi for the first time on VHS in 1986 at my cousin's house. I also saw Jedi in a theater on an American Air Force base in Frankfurt, Germany in 1987.
Also in '87 we finally got a VCR and the very first VHS tape I ever bought was this one:
http://www.swonvideo.com/vhs/vanhuk1987.htm
which I still have, £14.99 from my local WHSmith. Laserdisc never really took off in Britain so VHS was as good as it got for me.
Then I saw all the Special Editions and the Prequels at the Theater on 35mm and I've felt old and grumpy ever since ;)