101 years old now in 2025 - what year born?

Today, 19 April 2025 if a person is 101 years old now, what year was he born? See below:

If 101 years old, year of birth is:
1923 or 1924*

*It depends on whether he was born before or after 1 January 1924.

If now 101 years and his year of birth 1923 if he was born after 19 April 1923 until 31 december 1923 inclusively, and his year of birth is 1924 if he was born from 1 January 1924 to 19 April 1924.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 14 years, year of birth 2010 or 2011
If now 24 years, year of birth 2000 or 2001
If now 43 years, year of birth 1981 or 1982

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