78 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1946 until 31 december 1946 inclusively, and his year of birth is 1947 if he was born from 1 January 1947 to 19 December 1947.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 15 years, year of birth 2009 or 2010
If now 28 years, year of birth 1996 or 1997
If now 38 years, year of birth 1986 or 1987

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