70s for me.
The movies that made me pick the 70s are the following.
Superman I(Hackman, Reeve]
Enter The Dragon[Bruce Lee]
Godfather I and II[Brando, Pacino, De Niro etc.]
A Clockwork Orange
Taxi Driver[De Niro, Kitel(spelling)]
The Deer Hunter[De Niro, Walken]
The French Connection[Hackman]
Dog Day Afternoon[Pacino]
And Justice For All[Pacino]
The Poseidon Adventure[Hackman]
Mean Streets[De Niro]
I'm young, I was not around when these movies came out. I'm 23 now, but believe it or not, these are the movies I grew up watching on tv. As young as like 13 years old, I have seen all of these movies a bunch of times each already, and a lot more. Of course I saw other movies from the 80s and 90s growing up, but this is the decade that has some really unforgettable films for me.
I can name all of my favorite movies from the 70s-90s honestly and just make a super list, but I just had to go with the 70s.