73 years old now in 2023 - what year born?

Today, 26 September 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 26 September 1949 until 31 december 1949 inclusively, and his year of birth is 1950 if he was born from 1 January 1950 to 26 September 1950.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 17 years, year of birth 2005 or 2006
If now 19 years, year of birth 2003 or 2004
If now 90 years, year of birth 1932 or 1933

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