57 years old now in 2025 - what year born?

Today, 19 March 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 March 1967 until 31 december 1967 inclusively, and his year of birth is 1968 if he was born from 1 January 1968 to 19 March 1968.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 15 years, year of birth 2009 or 2010
If now 23 years, year of birth 2001 or 2002
If now 87 years, year of birth 1937 or 1938

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