139 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 139 years old now, what year was he born? See below:

If 139 years old, year of birth is:
1886 or 1887*

*It depends on whether he was born before or after 1 January 1887.

If now 139 years and his year of birth 1886 if he was born after 28 October 1886 until 31 december 1886 inclusively, and his year of birth is 1887 if he was born from 1 January 1887 to 28 October 1887.

Other examples:

If now 9 years, year of birth 2016 or 2017
If now 14 years, year of birth 2011 or 2012
If now 27 years, year of birth 1998 or 1999
If now 63 years, year of birth 1962 or 1963

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