The plural form of decade is decades.

What Is decade plural?

decade. /ˈdɛˌkeɪd/ plural decades. Learner's definition of DECADE. : a period of 10 years.

Do we use is or are with decades?

Names of decades and centuries (the 1800s, the 1970s, the eighties, the '90s) are generally considered plural but can also be singular. Use plural verbs to show a period of years (e.g., 1970 to '79); use singular verbs to refer to one period of time (e.g., the decade of the '70s).