27 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 27 years old now, what year was he born? See below:

If 27 years old, year of birth is:
1997 or 1998*

*It depends on whether he was born before or after 1 January 1998.

If now 27 years and his year of birth 1997 if he was born after 19 December 1997 until 31 december 1997 inclusively, and his year of birth is 1998 if he was born from 1 January 1998 to 19 December 1998.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 17 years, year of birth 2007 or 2008
If now 20 years, year of birth 2004 or 2005
If now 77 years, year of birth 1947 or 1948

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