Is there a pop culture marker you completely missed? For example, are you in your 40s but have never seen Star Wars?
Against all odds, I have somehow never seen Top Gun. I'm willing to bet very few movie-watching guys in this country who are my age can make the same claim. It wasn't intentional, it just ended up this way.
Top Gun was released in May 1986 when I was 11 years old. At 11, I may have been slightly too young to catch the movie in theatres. How I never caught it on VHS is rather puzzling.