124 years old now in 2022 - what year born?

Today, 6 December 2022 if a person is 124 years old now, what year was he born? See below:

If 124 years old, year of birth is:
1897 or 1898*

*It depends on whether he was born before or after 1 January 1898.

If now 124 years and his year of birth 1897 if he was born after 6 December 1897 until 31 december 1897 inclusively, and his year of birth is 1898 if he was born from 1 January 1898 to 6 December 1898.

Other examples:

If now 3 years, year of birth 2018 or 2019
If now 18 years, year of birth 2003 or 2004
If now 22 years, year of birth 1999 or 2000
If now 33 years, year of birth 1988 or 1989

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