27 years old now in 2023 - what year born?

Today, 7 December 2023 if a person is 27 years old now, what year was he born? See below:

If 27 years old, year of birth is:
1995 or 1996*

*It depends on whether he was born before or after 1 January 1996.

If now 27 years and his year of birth 1995 if he was born after 7 December 1995 until 31 december 1995 inclusively, and his year of birth is 1996 if he was born from 1 January 1996 to 7 December 1996.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 13 years, year of birth 2009 or 2010
If now 19 years, year of birth 2003 or 2004
If now 64 years, year of birth 1958 or 1959

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