125 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 125 years old now, what year was he born? See below:

If 125 years old, year of birth is:
1900 or 1901*

*It depends on whether he was born before or after 1 January 1901.

If now 125 years and his year of birth 1900 if he was born after 28 October 1900 until 31 december 1900 inclusively, and his year of birth is 1901 if he was born from 1 January 1901 to 28 October 1901.

Other examples:

If now 7 years, year of birth 2018 or 2019
If now 13 years, year of birth 2012 or 2013
If now 21 years, year of birth 2004 or 2005
If now 31 years, year of birth 1994 or 1995

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