There is no name for 15 other than related to 10 or 20. A decade is 10 years and a score is 20. So, 15 can be 3/4 score or 1.5 decades.
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1 Decade= 10 years
A decade is 10 years
A decade is a period of 10 years, honey. So, if you can count to 10, then you can figure out how long a decade is. It's not rocket science, darling.
There 10 years in a decade.
A decade is a spell of 10 years - a spell of 100 years is called a century.