There was a fundamental change in Hollywood in the late 60 early 70s, when a new generation of filmmakers came up through indie cinema and the studios. Those filmmakers changed the technique, style, and values of the studio system pretty dramatically. Many of those changes persist until today.

Also in the mid 70s, you had the rise of the modern high-concept blockbuster, with films such as JAWS and STAR WARS. Not to mention the advent of the modern superhero movie with SUPERMAN. Those changes have definitely held on until today, and shape not just the content, but also the form of much of modern movies.

There really was a qualitative change in movies around 1970, so it's not unusual if someone can relate more to movies from that point onward.

See:

https://en.wikipedia.org/wiki/New_Hollywood

and

https://en.wikipedia.org/wiki/High-concept