140 years old now in 2024 - what year born?

Today, 12 September 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 12 September 1883 until 31 december 1883 inclusively, and his year of birth is 1884 if he was born from 1 January 1884 to 12 September 1884.

Other examples:

If now 4 years, year of birth 2019 or 2020
If now 16 years, year of birth 2007 or 2008
If now 29 years, year of birth 1994 or 1995
If now 36 years, year of birth 1987 or 1988

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