67 years old now in 2025 - what year born?

Today, 21 May 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 21 May 1957 until 31 december 1957 inclusively, and his year of birth is 1958 if he was born from 1 January 1958 to 21 May 1958.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 18 years, year of birth 2006 or 2007
If now 24 years, year of birth 2000 or 2001
If now 33 years, year of birth 1991 or 1992

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