36 years old now in 2023 - what year born?

Today, 10 June 2023 if a person is 36 years old now, what year was he born? See below:

If 36 years old, year of birth is:
1986 or 1987*

*It depends on whether he was born before or after 1 January 1987.

If now 36 years and his year of birth 1986 if he was born after 10 June 1986 until 31 december 1986 inclusively, and his year of birth is 1987 if he was born from 1 January 1987 to 10 June 1987.

Other examples:

If now 8 years, year of birth 2014 or 2015
If now 15 years, year of birth 2007 or 2008
If now 18 years, year of birth 2004 or 2005
If now 39 years, year of birth 1983 or 1984

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