74 years old now in 2023 - what year born?

Today, 23 September 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 23 September 1948 until 31 december 1948 inclusively, and his year of birth is 1949 if he was born from 1 January 1949 to 23 September 1949.

Other examples:

If now 8 years, year of birth 2014 or 2015
If now 14 years, year of birth 2008 or 2009
If now 20 years, year of birth 2002 or 2003
If now 37 years, year of birth 1985 or 1986

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