48 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 48 years old now, what year was he born? See below:

If 48 years old, year of birth is:
1976 or 1977*

*It depends on whether he was born before or after 1 January 1977.

If now 48 years and his year of birth 1976 if he was born after 19 December 1976 until 31 december 1976 inclusively, and his year of birth is 1977 if he was born from 1 January 1977 to 19 December 1977.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 14 years, year of birth 2010 or 2011
If now 20 years, year of birth 2004 or 2005
If now 81 years, year of birth 1943 or 1944

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