107 years old now in 2025 - what year born?

Today, 20 March 2025 if a person is 107 years old now, what year was he born? See below:

If 107 years old, year of birth is:
1917 or 1918*

*It depends on whether he was born before or after 1 January 1918.

If now 107 years and his year of birth 1917 if he was born after 20 March 1917 until 31 december 1917 inclusively, and his year of birth is 1918 if he was born from 1 January 1918 to 20 March 1918.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 17 years, year of birth 2007 or 2008
If now 22 years, year of birth 2002 or 2003
If now 56 years, year of birth 1968 or 1969

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