49 years old now in 2023 - what year born?

Today, 30 November 2023 if a person is 49 years old now, what year was he born? See below:

If 49 years old, year of birth is:
1973 or 1974*

*It depends on whether he was born before or after 1 January 1974.

If now 49 years and his year of birth 1973 if he was born after 30 November 1973 until 31 december 1973 inclusively, and his year of birth is 1974 if he was born from 1 January 1974 to 30 November 1974.

Other examples:

If now 3 years, year of birth 2019 or 2020
If now 17 years, year of birth 2005 or 2006
If now 22 years, year of birth 2000 or 2001
If now 41 years, year of birth 1981 or 1982

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