Century = 100 years; decade = 10 years. Century = 100 years; decade = 10 years. Century = 100 years; decade = 10 years. Century = 100 years; decade = 10 years.

There are two hundred decades in two millennia. 10 years is a "decade." 100 years is a "century." 1000 years is a millennium 2000 years divided by 10 years is 200.

No, if you are 69 years old you are in your 7th decade. There are 10 years in a decade, and not forgetting to count the first ten years, you would get to the 7th decade.

A century is 100 years, whereas a decade is 10 years. There are 0 centuries in a decade. Technically there is one tenth of a century in a decade, but that's simply known as a decade.