120 years old now in 2025 - what year born?

Today, 22 April 2025 if a person is 120 years old now, what year was he born? See below:

If 120 years old, year of birth is:
1904 or 1905*

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

If now 120 years and his year of birth 1904 if he was born after 22 April 1904 until 31 december 1904 inclusively, and his year of birth is 1905 if he was born from 1 January 1905 to 22 April 1905.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 15 years, year of birth 2009 or 2010
If now 27 years, year of birth 1997 or 1998
If now 65 years, year of birth 1959 or 1960

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