The word sesquidecade means 'a period of one and a half decades.' i.e. 15 years.
Note: Although the word is in use, we have yet to find it listed in any English dictionary.
A period of 15 years is commonly referred to as a "decade and a half" or as a "quindecade."
A period of forty years is called a quadragennial.
A period of thirty years is called a "trio-decade" or simply a "thirty-year period."
You may be thinking of a "score", as in Lincoln's Gettysburg Address ('Four score and seven years ago' means 87 years ago.)It is also called two decades.
The Chinese, base on Taoist teaching is called a`lifetime`. The reason being, after the full cycle of the 12th animals in the Chinese lunar calender. The recycle period, from 61st will be call the new begining. They will celebrate by their family and relative with a big feast. That is call `coming of age` among their belief.
Translation: "I am 15 years old, and you?"
A Period of ten years is called a decade.
A period of 75 years is called a "septuagenary."
A period of 10 years is called a decade.
A period of 100 years is called a century.
A period of 100 years is called a century.
A period of ten years is a decade.
The period of 100 years is called a century. A period of 10 years is a decade, and 1000 years is a millennium.
1.5 decades (15 years does not have a specific name for that period of time.)
A period of 1 thousand year is called a millennium.
a five-year period is a quinquennium
A period in football is called a quarter and is 15 minutes long.
It is called nine centuries.