67 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 67 years old now, what year was he born? See below:

If 67 years old, year of birth is:
1957 or 1958*

*It depends on whether he was born before or after 1 January 1958.

If now 67 years and his year of birth 1957 if he was born after 19 December 1957 until 31 december 1957 inclusively, and his year of birth is 1958 if he was born from 1 January 1958 to 19 December 1958.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 16 years, year of birth 2008 or 2009
If now 28 years, year of birth 1996 or 1997
If now 40 years, year of birth 1984 or 1985

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