74 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 74 years old now, what year was he born? See below:

If 74 years old, year of birth is:
1948 or 1949*

*It depends on whether he was born before or after 1 January 1949.

If now 74 years and his year of birth 1948 if he was born after 22 March 1948 until 31 december 1948 inclusively, and his year of birth is 1949 if he was born from 1 January 1949 to 22 March 1949.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 18 years, year of birth 2004 or 2005
If now 24 years, year of birth 1998 or 1999
If now 66 years, year of birth 1956 or 1957

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