119 years old now in 2024 - what year born?

Today, 15 September 2024 if a person is 119 years old now, what year was he born? See below:

If 119 years old, year of birth is:
1904 or 1905*

*It depends on whether he was born before or after 1 January 1905.

If now 119 years and his year of birth 1904 if he was born after 15 September 1904 until 31 december 1904 inclusively, and his year of birth is 1905 if he was born from 1 January 1905 to 15 September 1905.

Other examples:

If now 9 years, year of birth 2014 or 2015
If now 14 years, year of birth 2009 or 2010
If now 26 years, year of birth 1997 or 1998
If now 97 years, year of birth 1926 or 1927

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