140 years old now in 2024 - what year born?

Today, 11 December 2024 if a person is 140 years old now, what year was he born? See below:

If 140 years old, year of birth is:
1883 or 1884*

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

If now 140 years and his year of birth 1883 if he was born after 11 December 1883 until 31 december 1883 inclusively, and his year of birth is 1884 if he was born from 1 January 1884 to 11 December 1884.

Other examples:

If now 9 years, year of birth 2014 or 2015
If now 18 years, year of birth 2005 or 2006
If now 21 years, year of birth 2002 or 2003
If now 65 years, year of birth 1958 or 1959

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