104 years old now in 2025 - what year born?

Today, 19 April 2025 if a person is 104 years old now, what year was he born? See below:

If 104 years old, year of birth is:
1920 or 1921*

*It depends on whether he was born before or after 1 January 1921.

If now 104 years and his year of birth 1920 if he was born after 19 April 1920 until 31 december 1920 inclusively, and his year of birth is 1921 if he was born from 1 January 1921 to 19 April 1921.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 13 years, year of birth 2011 or 2012
If now 23 years, year of birth 2001 or 2002
If now 88 years, year of birth 1936 or 1937

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