140 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1884 until 31 december 1884 inclusively, and his year of birth is 1885 if he was born from 1 January 1885 to 19 December 1885.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 12 years, year of birth 2012 or 2013
If now 28 years, year of birth 1996 or 1997
If now 70 years, year of birth 1954 or 1955

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