30 years old now in 2023 - what year born?

Today, 5 June 2023 if a person is 30 years old now, what year was he born? See below:

If 30 years old, year of birth is:
1992 or 1993*

*It depends on whether he was born before or after 1 January 1993.

If now 30 years and his year of birth 1992 if he was born after 5 June 1992 until 31 december 1992 inclusively, and his year of birth is 1993 if he was born from 1 January 1993 to 5 June 1993.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 16 years, year of birth 2006 or 2007
If now 29 years, year of birth 1993 or 1994
If now 61 years, year of birth 1961 or 1962

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