it is called "half a century"
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One decade is 10 years, so 5 decades = 50 years.There are: 5*10 = 50 years because a decade is 10 years
1 Decade= 10 years
1 decade is 10 years, thus: 1 year =1/10 decade = 0.1 decade
1 decade equals 10 years.
Since a decade is 10 years, one year is 1/10 of a decade.