106 years old now in 2025 - what year born?

Today, 21 May 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 21 May 1918 until 31 december 1918 inclusively, and his year of birth is 1919 if he was born from 1 January 1919 to 21 May 1919.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 18 years, year of birth 2006 or 2007
If now 29 years, year of birth 1995 or 1996
If now 40 years, year of birth 1984 or 1985

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