27 years old now in 2025 - what year born?

Today, 19 April 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 April 1997 until 31 december 1997 inclusively, and his year of birth is 1998 if he was born from 1 January 1998 to 19 April 1998.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 12 years, year of birth 2012 or 2013
If now 26 years, year of birth 1998 or 1999
If now 41 years, year of birth 1983 or 1984

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