The plural of twenty; can refer to the decade from 1920-1929 (the Roaring Twenties) or someone's age from 20-29.
From Middle English 'twenty,' derived from Old English 'twentiȝ' (two tens), with the suffix '-ies' making it plural; the 'Roaring Twenties' period name became iconic after the 1920s era of jazz and prosperity.
The 1920s were called the 'Roaring Twenties' because everything seemed wild and exciting—jazz music, cars, shorter skirts—but just 10 years later, the Great Depression hit, showing how quickly history can turn.
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