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Most of us use the Gregorian calendar to calculate age, but different cultures have different age reckoning systems. The Gregorian calendar is a solar calendar with 12 months of 28-31 days each. It is named after Pope Gregory XIII, who introduced it in October 1582. The Gregorian calendar is the most widely used calendar in the world today.
In the Gregorian calendar, there are four ways to calculate age:
1. by the number of completed years, e.g. a person who is 20 years old is in their 21st year of life
2. by the number of elapsed years since birth, e.g. a person who is 20 years old has been alive for 20 years
3. by the number of elapsed years since a specific reference point, e.g. a person who is 20 years old has been alive for 20 years since the year 2000
4. by the number of completed years since a specific reference point, e.g. a person who is 20 years old is in their 21st year since the year 2000
The Gregorian calendar is used to calculate age in most of the world today. However, there are some cultures that have different age reckoning systems.
In the Chinese age system, people are born at age 1 and the age grows up at the Chinese New Year instead of birthday. For example, if one baby was born just one day before the Chinese New Year, 2 days later, the baby will be at age 2 even though he/she is only 2 days old.
In the Islamic age system, the age of a person is calculated from the day of their birth to the day of their death. For example, a person who was born on January 1, 2000 and died on January 1, 2020 would be considered to be 20 years old.
There are many other age reckoning systems in use around the world, but the Gregorian calendar is the most widely used.
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