116 years old now in 2025 - what year born?

Today, 20 March 2025 if a person is 116 years old now, what year was he born? See below:

If 116 years old, year of birth is:
1908 or 1909*

*It depends on whether he was born before or after 1 January 1909.

If now 116 years and his year of birth 1908 if he was born after 20 March 1908 until 31 december 1908 inclusively, and his year of birth is 1909 if he was born from 1 January 1909 to 20 March 1909.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 12 years, year of birth 2012 or 2013
If now 22 years, year of birth 2002 or 2003
If now 84 years, year of birth 1940 or 1941

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