When my family lived in Germany, I would regularly visit my German grandmother in Waldorf, Germany every weekend. There was a movie theater there that would show Godzilla and Kung Fu movies every Saturday. I would go there with some American friends that lived nearby. The theater was probably around since the 40s or 50s. The seats were all wood. Anyway, I remember coming out of the theater after a Bruce Lee movie and we would all be ready to play pretend-fight games as if we were kung-fu fighters. That was back in the late 70s.
Only remember going to one movie without an adult present when I was a kid and I had a friend with me. We were both under ten at the time and we saw "The Love Bug" when it was rereleased in the 1972 to 1974 time frame. Just like Siskel and Ebert, and this was long before they became famous, we snuck into the closed balcony to watch the movie.
When it comes to going to a movie by myself I was in my late thirties and the only one I can remember where I went alone was to watch "Die Another Day" in 2002 or 2003. Even with Halle Berry in it I absolutely thought the movie stank to high heaven. The tidal wave, parasail surfing scene was the absolute worst special effect I had ever seen in a Bond film. Had it not been for the fact I had been sitting in traffic for two hours going practically nowhere I wouldn't have done it then.