By oldest, I mean oldest physical video, not the movie contained on it. In other words, a copy of Gone With the Wind from 1995 wouldn't beat out a copy of the Graduate from 1980.
I was at my local Blockbuster (I live in the ghetto, it's my only option) and noticed a VHS copy of Greased Lightning
that has to be atleast 20 years old. The movie is copyrighted 1977, so I wouldn't be surprised if it's the original home video release. The question is, why does Blockbuster have such an old video? They haven't been around that long, have they?