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.
A period of twenty years is called a "score."
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."
It used to be called a score. So four score and 7 years would be 87 years.
The word for every twenty years is "score."
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.
a silver jubilee
A golden jubilee
That is the correct spelling of the period of "twenty-seven years" (27 years).
Twenty years
A person who is twenty years old is called a "young adult" or a "young person."
A Period of ten years is called a decade.
A period of 75 years is called a "septuagenary."
Twenty 'things' is a "Score". Example: Four score years is 80 years.
A period of 10 years is called a decade.
A period of 100 years is called a century.
20 years is called a score. This is derived from the Old English word "scoru", which means "twenty", and is used to describe a period of 20 years. A score is sometimes referred to as a "generation" or a "double decade".
A period of 100 years is called a century.