139 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 139 years old now, what year was he born? See below:

If 139 years old, year of birth is:
1884 or 1885*

*It depends on whether he was born before or after 1 January 1885.

If now 139 years and his year of birth 1884 if he was born after 15 October 1884 until 31 december 1884 inclusively, and his year of birth is 1885 if he was born from 1 January 1885 to 15 October 1885.

Other examples:

If now 11 years, year of birth 2012 or 2013
If now 14 years, year of birth 2009 or 2010
If now 20 years, year of birth 2003 or 2004
If now 41 years, year of birth 1982 or 1983

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