139 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 139 years old now, what year was he born? See below:

If 139 years old, year of birth is:
1883 or 1884*

*It depends on whether he was born before or after 1 January 1884.

If now 139 years and his year of birth 1883 if he was born after 1 December 1883 until 31 december 1883 inclusively, and his year of birth is 1884 if he was born from 1 January 1884 to 1 December 1884.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 13 years, year of birth 2009 or 2010
If now 18 years, year of birth 2004 or 2005
If now 73 years, year of birth 1949 or 1950

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