129 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 129 years old now, what year was he born? See below:

If 129 years old, year of birth is:
1896 or 1897*

*It depends on whether he was born before or after 1 January 1897.

If now 129 years and his year of birth 1896 if he was born after 28 October 1896 until 31 december 1896 inclusively, and his year of birth is 1897 if he was born from 1 January 1897 to 28 October 1897.

Other examples:

If now 6 years, year of birth 2019 or 2020
If now 17 years, year of birth 2008 or 2009
If now 22 years, year of birth 2003 or 2004
If now 36 years, year of birth 1989 or 1990

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