115 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 115 years old now, what year was he born? See below:

If 115 years old, year of birth is:
1907 or 1908*

*It depends on whether he was born before or after 1 January 1908.

If now 115 years and his year of birth 1907 if he was born after 22 March 1907 until 31 december 1907 inclusively, and his year of birth is 1908 if he was born from 1 January 1908 to 22 March 1908.

Other examples:

If now 4 years, year of birth 2018 or 2019
If now 17 years, year of birth 2005 or 2006
If now 18 years, year of birth 2004 or 2005
If now 91 years, year of birth 1931 or 1932

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