20s noun[plural only]3 •The decade of the 2020s. •The decade of the 1920s. •A range of the numbers twenty (20) to twenty-nine (29).In his 20s he was a freelance window cleaner, 50p a pane, when one of his clients – a lady in Aberystwyth – asked if he would clear out a vacated property she managed. — 2025
