A decade is 10 years so eight and a half decades is 85 years.
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There are eight decades in 80 years. A decade is a period of 10 years, so to determine how many decades are in 80 years, you simply divide 80 by 10. This calculation gives you 8 decades in 80 years.
There are 3.5 decades in 35 years
There are 20 years in two decades.
If you mean decades then there are 10 decades in 100 years
60 years = 6 decades.