16 years old now in 2025 - what year born?

Today, 16 June 2025 if a person is 16 years old now, what year was he born? See below:

If 16 years old, year of birth is:
2008 or 2009*

*It depends on whether he was born before or after 1 January 2009.

If now 16 years and his year of birth 2008 if he was born after 16 June 2008 until 31 december 2008 inclusively, and his year of birth is 2009 if he was born from 1 January 2009 to 16 June 2009.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 13 years, year of birth 2011 or 2012
If now 20 years, year of birth 2004 or 2005
If now 71 years, year of birth 1953 or 1954

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