106 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 106 years old now, what year was he born? See below:

If 106 years old, year of birth is:
1916 or 1917*

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

If now 106 years and his year of birth 1916 if he was born after 1 December 1916 until 31 december 1916 inclusively, and his year of birth is 1917 if he was born from 1 January 1917 to 1 December 1917.

Other examples:

If now 4 years, year of birth 2018 or 2019
If now 14 years, year of birth 2008 or 2009
If now 23 years, year of birth 1999 or 2000
If now 61 years, year of birth 1961 or 1962

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