126 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 126 years old now, what year was he born? See below:

If 126 years old, year of birth is:
1897 or 1898*

*It depends on whether he was born before or after 1 January 1898.

If now 126 years and his year of birth 1897 if he was born after 15 October 1897 until 31 december 1897 inclusively, and his year of birth is 1898 if he was born from 1 January 1898 to 15 October 1898.

Other examples:

If now 5 years, year of birth 2018 or 2019
If now 15 years, year of birth 2008 or 2009
If now 20 years, year of birth 2003 or 2004
If now 90 years, year of birth 1933 or 1934

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