124 years old now in 2025 - what year born?

Today, 8 July 2025 if a person is 124 years old now, what year was he born? See below:

If 124 years old, year of birth is:
1900 or 1901*

*It depends on whether he was born before or after 1 January 1901.

If now 124 years and his year of birth 1900 if he was born after 8 July 1900 until 31 december 1900 inclusively, and his year of birth is 1901 if he was born from 1 January 1901 to 8 July 1901.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 17 years, year of birth 2007 or 2008
If now 19 years, year of birth 2005 or 2006
If now 78 years, year of birth 1946 or 1947

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