67 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 67 years old now, what year was he born? See below:

If 67 years old, year of birth is:
1956 or 1957*

*It depends on whether he was born before or after 1 January 1957.

If now 67 years and his year of birth 1956 if he was born after 12 September 1956 until 31 december 1956 inclusively, and his year of birth is 1957 if he was born from 1 January 1957 to 12 September 1957.

Other examples:

If now 7 years, year of birth 2016 or 2017
If now 12 years, year of birth 2011 or 2012
If now 25 years, year of birth 1998 or 1999
If now 51 years, year of birth 1972 or 1973

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