73 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 73 years old now, what year was he born? See below:

If 73 years old, year of birth is:
1950 or 1951*

*It depends on whether he was born before or after 1 January 1951.

If now 73 years and his year of birth 1950 if he was born after 15 October 1950 until 31 december 1950 inclusively, and his year of birth is 1951 if he was born from 1 January 1951 to 15 October 1951.

Other examples:

If now 4 years, year of birth 2019 or 2020
If now 13 years, year of birth 2010 or 2011
If now 21 years, year of birth 2002 or 2003
If now 81 years, year of birth 1942 or 1943

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