77 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1947 until 31 december 1947 inclusively, and his year of birth is 1948 if he was born from 1 January 1948 to 19 December 1948.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 13 years, year of birth 2011 or 2012
If now 23 years, year of birth 2001 or 2002
If now 55 years, year of birth 1969 or 1970

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