38 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 38 years old now, what year was he born? See below:

If 38 years old, year of birth is:
1984 or 1985*

*It depends on whether he was born before or after 1 January 1985.

If now 38 years and his year of birth 1984 if he was born after 22 March 1984 until 31 december 1984 inclusively, and his year of birth is 1985 if he was born from 1 January 1985 to 22 March 1985.

Other examples:

If now 10 years, year of birth 2012 or 2013
If now 14 years, year of birth 2008 or 2009
If now 28 years, year of birth 1994 or 1995
If now 66 years, year of birth 1956 or 1957

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