49 years old now in 2023 - what year born?

Today, 5 June 2023 if a person is 49 years old now, what year was he born? See below:

If 49 years old, year of birth is:
1973 or 1974*

*It depends on whether he was born before or after 1 January 1974.

If now 49 years and his year of birth 1973 if he was born after 5 June 1973 until 31 december 1973 inclusively, and his year of birth is 1974 if he was born from 1 January 1974 to 5 June 1974.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 12 years, year of birth 2010 or 2011
If now 18 years, year of birth 2004 or 2005
If now 53 years, year of birth 1969 or 1970

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