If one follows the thumb rule of the calendar history, the year 20,000 B.C. was about 40,000 years ago.
What is a year?
A year is a period, which normally consists of 365 days. A leap year, which comes once every four years, consists of 366 days, as there are 29 days in February of a leap year.
The year is decided as per the rules of a Gregorian calendar. According to this calendar, exactly the double number of years of the current year have taken place in the world.
Thus, for 20000 B.C., it is at least, 40000 years old.
Hence, the significance of a year is aforementioned.
Learn more about a year here:
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