57 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 57 years old now, what year was he born? See below:

If 57 years old, year of birth is:
1966 or 1967*

*It depends on whether he was born before or after 1 January 1967.

If now 57 years and his year of birth 1966 if he was born after 15 October 1966 until 31 december 1966 inclusively, and his year of birth is 1967 if he was born from 1 January 1967 to 15 October 1967.

Other examples:

If now 9 years, year of birth 2014 or 2015
If now 13 years, year of birth 2010 or 2011
If now 21 years, year of birth 2002 or 2003
If now 60 years, year of birth 1963 or 1964

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