124 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 124 years old now, what year was he born? See below:

If 124 years old, year of birth is:
1899 or 1900*

*It depends on whether he was born before or after 1 January 1900.

If now 124 years and his year of birth 1899 if he was born after 12 September 1899 until 31 december 1899 inclusively, and his year of birth is 1900 if he was born from 1 January 1900 to 12 September 1900.

Other examples:

If now 9 years, year of birth 2014 or 2015
If now 13 years, year of birth 2010 or 2011
If now 30 years, year of birth 1993 or 1994
If now 98 years, year of birth 1925 or 1926

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