78 years old now in 2025 - what year born?

Today, 22 April 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 22 April 1946 until 31 december 1946 inclusively, and his year of birth is 1947 if he was born from 1 January 1947 to 22 April 1947.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 14 years, year of birth 2010 or 2011
If now 20 years, year of birth 2004 or 2005
If now 72 years, year of birth 1952 or 1953

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