101 years old now in 2025 - what year born?

Today, 18 January 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 18 January 1923 until 31 december 1923 inclusively, and his year of birth is 1924 if he was born from 1 January 1924 to 18 January 1924.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 14 years, year of birth 2010 or 2011
If now 27 years, year of birth 1997 or 1998
If now 59 years, year of birth 1965 or 1966

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