78 years old now in 2025 - what year born?

Today, 23 January 2025 if a person is 78 years old now, what year was he born? See below:

If 78 years old, year of birth is:
1946 or 1947*

*It depends on whether he was born before or after 1 January 1947.

If now 78 years and his year of birth 1946 if he was born after 23 January 1946 until 31 december 1946 inclusively, and his year of birth is 1947 if he was born from 1 January 1947 to 23 January 1947.

Other examples:

If now 8 years, year of birth 2016 or 2017
If now 12 years, year of birth 2012 or 2013
If now 19 years, year of birth 2005 or 2006
If now 86 years, year of birth 1938 or 1939

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