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# How Many Years Is a Decade?

A decade is a group of ten years. The tenth digit of a calendar year is always the end of a decade. The English language uses the word decade to describe periods of time. The 20th century began in the early 1950s. The roaring twenties was a period of social change, economic growth, and political dynamism in the United States. Because of its significance in history, the concept of a decade is an important one to understand.

A decade is defined as a ten-year span. It can be a period of time in a person’s life, or it can be a ten-year grouping in the western calendar. Historically, a decade was the 1980s (1980s), which lasted from 1980 to 1989. A decade can also be a period of history, such as the 1960s and 1970s.

The tenth decade of the Gregorian calendar begins on January 1, 2020, and ends on December 31, 2020. This is also the beginning of the next century (the 21st century). The current decade is the 2020s, which is short for the twenty-twenties. This decade will end on 31 December 2029, which is the next ten-digit decade. If you’re not sure, a decade is ten years longer than a century.