Post-apocalyptic/dystopian, and it will be too slow for most people.
I finally got to watch this, as I only knew of a later version called The Omega Man starring Charlton Heston.
The Omega Man was repeated a lot on TV in the 1970s and 1980s, and clearly it was a remake (for the most part) of this Vincent Price classic.
Since I never seen it before, I skipped the black and white version , for the colourized one on this dvd. Dark / dingy lighting, sort of like a Hammer Horror or any horror B-movie released later.
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The Last Man on Earth