70 years old now in 2023 - what year born?

Today, 27 March 2023 if a person is 70 years old now, what year was he born? See below:

If 70 years old, year of birth is:
1952 or 1953*

*It depends on whether he was born before or after 1 January 1953.

If now 70 years and his year of birth 1952 if he was born after 27 March 1952 until 31 december 1952 inclusively, and his year of birth is 1953 if he was born from 1 January 1953 to 27 March 1953.

Other examples:

If now 10 years, year of birth 2012 or 2013
If now 17 years, year of birth 2005 or 2006
If now 29 years, year of birth 1993 or 1994
If now 69 years, year of birth 1953 or 1954

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