77 years old now in 2025 - what year born?

Today, 24 April 2025 if a person is 77 years old now, what year was he born? See below:

If 77 years old, year of birth is:
1947 or 1948*

*It depends on whether he was born before or after 1 January 1948.

If now 77 years and his year of birth 1947 if he was born after 24 April 1947 until 31 december 1947 inclusively, and his year of birth is 1948 if he was born from 1 January 1948 to 24 April 1948.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 14 years, year of birth 2010 or 2011
If now 23 years, year of birth 2001 or 2002
If now 84 years, year of birth 1940 or 1941

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