60s noun[plural only]2 •The decade of the 1960s.I suppose you could blame it on my generation, chickens from the 60s finally coming into roost. — 1995 •A range of the numbers sixty (60) to sixty-nine (69).Many of his friends are joining a burgeoning international community of elderweds, or those who marry in their 60s, 70s or even 80s. — 2002