No.
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100 / 5 = 20 years
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.
A score is twenty (20) so there are 5 score years in a century.
100 years = 1 century 200 years = 2 centuries . . 500 years = 5 centuries . . 1,000 years = 10 centuries . . 2,000 years = 20 centuries
Since a century is 100 years, half a century would be 50. So, the answer is 50 years.