58 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 58 years old now, what year was he born? See below:

If 58 years old, year of birth is:
1966 or 1967*

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

If now 58 years and his year of birth 1966 if he was born after 19 December 1966 until 31 december 1966 inclusively, and his year of birth is 1967 if he was born from 1 January 1967 to 19 December 1967.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 15 years, year of birth 2009 or 2010
If now 30 years, year of birth 1994 or 1995
If now 31 years, year of birth 1993 or 1994

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