28 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1996 until 31 december 1996 inclusively, and his year of birth is 1997 if he was born from 1 January 1997 to 19 December 1997.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 13 years, year of birth 2011 or 2012
If now 20 years, year of birth 2004 or 2005
If now 74 years, year of birth 1950 or 1951

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