Who decided that decades start at xxx0 even though centuries start at xx01? What were they smoking? Are there only 9 years in the first decade of the gregorian calendar?
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Also, we are specifically counting centutries (21st) while we do not count decades. Nobody is going to celebrate the 203rd decade ( which would start next year ). Instead, we celebrate the 2020s which has nothing to do with how many decades have passed.
I've seen phrases like "historic document from the 178th decade" in auction catalogues. I don't think it's very common, but definitely not unheard of.
