Olympiads were not held in the years of World Wars I and Two.
There are the Summer and the Winter Olympics held every 4 years.
400 years passed between the beginning of the Mayan civilization and its decline
61 years have passed
2000 years
490 years
83 years.
Not counting 510 BC or AD 25, 533 years passed between the two.
How many years have passed between the first and the last buriels from 1921 to 1984?
49 years passed
49 years passed
A decade is 10 years. Since there are 20 years from 1942 to 1962, that would be 2 decades.