140 years old now in 2025 - what year born?

Today, 24 April 2025 if a person is 140 years old now, what year was he born? See below:

If 140 years old, year of birth is:
1884 or 1885*

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

If now 140 years and his year of birth 1884 if he was born after 24 April 1884 until 31 december 1884 inclusively, and his year of birth is 1885 if he was born from 1 January 1885 to 24 April 1885.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 18 years, year of birth 2006 or 2007
If now 20 years, year of birth 2004 or 2005
If now 86 years, year of birth 1938 or 1939

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