53 years old now in 2023 - what year born?

Today, 23 September 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 23 September 1969 until 31 december 1969 inclusively, and his year of birth is 1970 if he was born from 1 January 1970 to 23 September 1970.

Other examples:

If now 7 years, year of birth 2015 or 2016
If now 15 years, year of birth 2007 or 2008
If now 19 years, year of birth 2003 or 2004
If now 83 years, year of birth 1939 or 1940

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