106 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 106 years old now, what year was he born? See below:

If 106 years old, year of birth is:
1918 or 1919*

*It depends on whether he was born before or after 1 January 1919.

If now 106 years and his year of birth 1918 if he was born after 19 December 1918 until 31 december 1918 inclusively, and his year of birth is 1919 if he was born from 1 January 1919 to 19 December 1919.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 17 years, year of birth 2007 or 2008
If now 18 years, year of birth 2006 or 2007
If now 36 years, year of birth 1988 or 1989

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