19 years old now in 2024 - what year born?

Today, 4 December 2024 if a person is 19 years old now, what year was he born? See below:

If 19 years old, year of birth is:
2004 or 2005*

*It depends on whether he was born before or after 1 January 2005.

If now 19 years and his year of birth 2004 if he was born after 4 December 2004 until 31 december 2004 inclusively, and his year of birth is 2005 if he was born from 1 January 2005 to 4 December 2005.

Other examples:

If now 7 years, year of birth 2016 or 2017
If now 12 years, year of birth 2011 or 2012
If now 18 years, year of birth 2005 or 2006
If now 83 years, year of birth 1940 or 1941

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