53 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 53 years old now, what year was he born? See below:

If 53 years old, year of birth is:
1969 or 1970*

*It depends on whether he was born before or after 1 January 1970.

If now 53 years and his year of birth 1969 if he was born after 22 March 1969 until 31 december 1969 inclusively, and his year of birth is 1970 if he was born from 1 January 1970 to 22 March 1970.

Other examples:

If now 4 years, year of birth 2018 or 2019
If now 14 years, year of birth 2008 or 2009
If now 25 years, year of birth 1997 or 1998
If now 73 years, year of birth 1949 or 1950

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