52 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 52 years old now, what year was he born? See below:

If 52 years old, year of birth is:
1971 or 1972*

*It depends on whether he was born before or after 1 January 1972.

If now 52 years and his year of birth 1971 if he was born after 12 September 1971 until 31 december 1971 inclusively, and his year of birth is 1972 if he was born from 1 January 1972 to 12 September 1972.

Other examples:

If now 4 years, year of birth 2019 or 2020
If now 12 years, year of birth 2011 or 2012
If now 24 years, year of birth 1999 or 2000
If now 66 years, year of birth 1957 or 1958

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