47 years old now in 2023 - what year born?

Today, 1 February 2023 if a person is 47 years old now, what year was he born? See below:

If 47 years old, year of birth is:
1975 or 1976*

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

If now 47 years and his year of birth 1975 if he was born after 1 February 1975 until 31 december 1975 inclusively, and his year of birth is 1976 if he was born from 1 January 1976 to 1 February 1976.

Other examples:

If now 3 years, year of birth 2019 or 2020
If now 16 years, year of birth 2006 or 2007
If now 18 years, year of birth 2004 or 2005
If now 63 years, year of birth 1959 or 1960

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