106 years old now in 2024 - what year born?

Today, 11 December 2024 if a person is 106 years old now, what year was he born? See below:

If 106 years old, year of birth is:
1917 or 1918*

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

If now 106 years and his year of birth 1917 if he was born after 11 December 1917 until 31 december 1917 inclusively, and his year of birth is 1918 if he was born from 1 January 1918 to 11 December 1918.

Other examples:

If now 4 years, year of birth 2019 or 2020
If now 18 years, year of birth 2005 or 2006
If now 26 years, year of birth 1997 or 1998
If now 74 years, year of birth 1949 or 1950

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