19 years old now in 2025 - what year born?

Today, 22 April 2025 if a person is 19 years old now, what year was he born? See below:

If 19 years old, year of birth is:
2005 or 2006*

*It depends on whether he was born before or after 1 January 2006.

If now 19 years and his year of birth 2005 if he was born after 22 April 2005 until 31 december 2005 inclusively, and his year of birth is 2006 if he was born from 1 January 2006 to 22 April 2006.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 17 years, year of birth 2007 or 2008
If now 18 years, year of birth 2006 or 2007
If now 68 years, year of birth 1956 or 1957

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