58 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 58 years old now, what year was he born? See below:

If 58 years old, year of birth is:
1964 or 1965*

*It depends on whether he was born before or after 1 January 1965.

If now 58 years and his year of birth 1964 if he was born after 1 December 1964 until 31 december 1964 inclusively, and his year of birth is 1965 if he was born from 1 January 1965 to 1 December 1965.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 12 years, year of birth 2010 or 2011
If now 29 years, year of birth 1993 or 1994
If now 83 years, year of birth 1939 or 1940

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