108 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 108 years old now, what year was he born? See below:

If 108 years old, year of birth is:
1916 or 1917*

*It depends on whether he was born before or after 1 January 1917.

If now 108 years and his year of birth 1916 if he was born after 19 December 1916 until 31 december 1916 inclusively, and his year of birth is 1917 if he was born from 1 January 1917 to 19 December 1917.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 15 years, year of birth 2009 or 2010
If now 18 years, year of birth 2006 or 2007
If now 32 years, year of birth 1992 or 1993

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