73 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 73 years old now, what year was he born? See below:

If 73 years old, year of birth is:
1949 or 1950*

*It depends on whether he was born before or after 1 January 1950.

If now 73 years and his year of birth 1949 if he was born after 22 March 1949 until 31 december 1949 inclusively, and his year of birth is 1950 if he was born from 1 January 1950 to 22 March 1950.

Other examples:

If now 6 years, year of birth 2016 or 2017
If now 13 years, year of birth 2009 or 2010
If now 26 years, year of birth 1996 or 1997
If now 68 years, year of birth 1954 or 1955

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