124 years old now in 2023 - what year born?

Today, 1 December 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 1 December 1898 until 31 december 1898 inclusively, and his year of birth is 1899 if he was born from 1 January 1899 to 1 December 1899.

Other examples:

If now 3 years, year of birth 2019 or 2020
If now 14 years, year of birth 2008 or 2009
If now 29 years, year of birth 1993 or 1994
If now 96 years, year of birth 1926 or 1927

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