47 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 47 years old now, what year was he born? See below:

If 47 years old, year of birth is:
1976 or 1977*

*It depends on whether he was born before or after 1 January 1977.

If now 47 years and his year of birth 1976 if he was born after 12 September 1976 until 31 december 1976 inclusively, and his year of birth is 1977 if he was born from 1 January 1977 to 12 September 1977.

Other examples:

If now 5 years, year of birth 2018 or 2019
If now 15 years, year of birth 2008 or 2009
If now 19 years, year of birth 2004 or 2005
If now 75 years, year of birth 1948 or 1949

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