How many letters does the top answer for “the decade from 1950 to 1959” have?

The most common answer is fifties (7 letters).

Crossword clue: the decade from 1950 to 1959

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

fifties 7 letters wn-def

the decade from 1950 to 1959

the decade from 1890 to 1899 100% similar → nineties

the decade from 1960 to 1969 100% similar → sixties

another word for decade 50% similar → decennary, decennium