48 years old now in 2024 - what year born?

Today, 14 October 2024 if a person is 48 years old now, what year was he born? See below:

If 48 years old, year of birth is:
1975 or 1976*

*It depends on whether he was born before or after 1 January 1976.

If now 48 years and his year of birth 1975 if he was born after 14 October 1975 until 31 december 1975 inclusively, and his year of birth is 1976 if he was born from 1 January 1976 to 14 October 1976.

Other examples:

If now 9 years, year of birth 2014 or 2015
If now 14 years, year of birth 2009 or 2010
If now 25 years, year of birth 1998 or 1999
If now 57 years, year of birth 1966 or 1967

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