75 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 75 years old now, what year was he born? See below:

If 75 years old, year of birth is:
1947 or 1948*

*It depends on whether he was born before or after 1 January 1948.

If now 75 years and his year of birth 1947 if he was born after 22 March 1947 until 31 december 1947 inclusively, and his year of birth is 1948 if he was born from 1 January 1948 to 22 March 1948.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 17 years, year of birth 2005 or 2006
If now 20 years, year of birth 2002 or 2003
If now 49 years, year of birth 1973 or 1974

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