57 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 57 years old now, what year was he born? See below:

If 57 years old, year of birth is:
1967 or 1968*

*It depends on whether he was born before or after 1 January 1968.

If now 57 years and his year of birth 1967 if he was born after 19 December 1967 until 31 december 1967 inclusively, and his year of birth is 1968 if he was born from 1 January 1968 to 19 December 1968.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 13 years, year of birth 2011 or 2012
If now 30 years, year of birth 1994 or 1995
If now 100 years, year of birth 1924 or 1925

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