46 years old now in 2023 - what year born?

Today, 1 February 2023 if a person is 46 years old now, what year was he born? See below:

If 46 years old, year of birth is:
1976 or 1977*

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

If now 46 years and his year of birth 1976 if he was born after 1 February 1976 until 31 december 1976 inclusively, and his year of birth is 1977 if he was born from 1 January 1977 to 1 February 1977.

Other examples:

If now 3 years, year of birth 2019 or 2020
If now 17 years, year of birth 2005 or 2006
If now 21 years, year of birth 2001 or 2002
If now 64 years, year of birth 1958 or 1959

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