28 years old now in 2025 - what year born?

Today, 21 May 2025 if a person is 28 years old now, what year was he born? See below:

If 28 years old, year of birth is:
1996 or 1997*

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

If now 28 years and his year of birth 1996 if he was born after 21 May 1996 until 31 december 1996 inclusively, and his year of birth is 1997 if he was born from 1 January 1997 to 21 May 1997.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 15 years, year of birth 2009 or 2010
If now 18 years, year of birth 2006 or 2007
If now 96 years, year of birth 1928 or 1929

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