124 years old now in 2023 - what year born?

Today, 26 March 2023 if a person is 124 years old now, what year was he born? See below:

If 124 years old, year of birth is:
1898 or 1899*

*It depends on whether he was born before or after 1 January 1899.

If now 124 years and his year of birth 1898 if he was born after 26 March 1898 until 31 december 1898 inclusively, and his year of birth is 1899 if he was born from 1 January 1899 to 26 March 1899.

Other examples:

If now 7 years, year of birth 2015 or 2016
If now 17 years, year of birth 2005 or 2006
If now 19 years, year of birth 2003 or 2004
If now 33 years, year of birth 1989 or 1990

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