57 years old now in 2023 - what year born?

Today, 7 December 2023 if a person is 57 years old now, what year was he born? See below:

If 57 years old, year of birth is:
1965 or 1966*

*It depends on whether he was born before or after 1 January 1966.

If now 57 years and his year of birth 1965 if he was born after 7 December 1965 until 31 december 1965 inclusively, and his year of birth is 1966 if he was born from 1 January 1966 to 7 December 1966.

Other examples:

If now 6 years, year of birth 2016 or 2017
If now 18 years, year of birth 2004 or 2005
If now 27 years, year of birth 1995 or 1996
If now 89 years, year of birth 1933 or 1934

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