27 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 27 years old now, what year was he born? See below:

If 27 years old, year of birth is:
1996 or 1997*

*It depends on whether he was born before or after 1 January 1997.

If now 27 years and his year of birth 1996 if he was born after 12 September 1996 until 31 december 1996 inclusively, and his year of birth is 1997 if he was born from 1 January 1997 to 12 September 1997.

Other examples:

If now 9 years, year of birth 2014 or 2015
If now 14 years, year of birth 2009 or 2010
If now 28 years, year of birth 1995 or 1996
If now 70 years, year of birth 1953 or 1954

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