66 years old now in 2023 - what year born?

Today, 5 June 2023 if a person is 66 years old now, what year was he born? See below:

If 66 years old, year of birth is:
1956 or 1957*

*It depends on whether he was born before or after 1 January 1957.

If now 66 years and his year of birth 1956 if he was born after 5 June 1956 until 31 december 1956 inclusively, and his year of birth is 1957 if he was born from 1 January 1957 to 5 June 1957.

Other examples:

If now 4 years, year of birth 2018 or 2019
If now 17 years, year of birth 2005 or 2006
If now 30 years, year of birth 1992 or 1993
If now 83 years, year of birth 1939 or 1940

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