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Is 5 years a decade? A decade is a period of 10 years. The word is derived (via French and Latin) from the Ancient Greek: δεκάς, romanized: dekas, which means a group of ten. Decades may describe any ten-year period, such as those of a person’s life, or refer to specific groupings of calendar years.

What is the longest measure of time? The word for the longest measurement of time is kalpa, Hindi for 432 billion years. A year is the time it takes for the earth to revolve around the sun once. A calendar year is 365 days.

What is a 25 year span called? silver jubilee: 25th anniversary. golden jubilee: 50th anniversary. diamond jubilee: 60th anniversary (or 75th anniversary)

How long is a Vicennial? of or for 20 years. occurring every 20 years.

What is a person 70 years old called? Definition of septuagenarian : a person whose age is in the seventies.

What is another name for 70th birthday? of the age of 70 years or between 70 and 80 years old.

What do you call a person in their seventies? Definition of septuagenarian : a person whose age is in the seventies.

What are 110 year olds called? A person between 100 and 109 is called a centenarian. A person 110 years old or older is called a supercentenarian.

What is a 100000 year period called? Decade: Ten (10) years. Century: One hundred (100) years. Millennium: One thousand (1,000) years.

How much is 4 eons? 0.5 billion years