For all we know, human kind peaked when Moses led the Jews out of Egypt. Honestly, you'd have to live several thousand years to be able to answer that question. Why worry about something that can't possibly be proven within one's lifetime?
Obviously this is opinion and guesswork, but in my opinion, no era without a minimum baseline of tech like running water, penicillin, guitars, movies, personal freedom, etc... can even contend. So this thing basically starts in the 1950s.