106 years old now in 2024 - what year born?

Today, 12 September 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 12 September 1917 until 31 december 1917 inclusively, and his year of birth is 1918 if he was born from 1 January 1918 to 12 September 1918.

Other examples:

If now 12 years, year of birth 2011 or 2012
If now 15 years, year of birth 2008 or 2009
If now 20 years, year of birth 2003 or 2004
If now 84 years, year of birth 1939 or 1940

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