139 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 139 years old now, what year was he born? See below:

If 139 years old, year of birth is:
1885 or 1886*

*It depends on whether he was born before or after 1 January 1886.

If now 139 years and his year of birth 1885 if he was born after 19 December 1885 until 31 december 1885 inclusively, and his year of birth is 1886 if he was born from 1 January 1886 to 19 December 1886.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 14 years, year of birth 2010 or 2011
If now 20 years, year of birth 2004 or 2005
If now 90 years, year of birth 1934 or 1935

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