I've never heard any book published after the 1930s referred to as a classic.
I think everyone in this thread is disagreeing over what classic means. THere's "this is so good it's classic" and then there's "this book is a Classic (as in a semi-genre, a stage of writing).
I don't have a set date, but most of the classics I know of are pre-1910 but obviously a few in the 20s and 30s.
As for my input, I"d have to save Last of the Mohicans, Dracula, or Frankenstein.
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