16 years old now in 2023 - what year born?

Today, 31 January 2023 if a person is 16 years old now, what year was he born? See below:

If 16 years old, year of birth is:
2006 or 2007*

*It depends on whether he was born before or after 1 January 2007.

If now 16 years and his year of birth 2006 if he was born after 31 January 2006 until 31 december 2006 inclusively, and his year of birth is 2007 if he was born from 1 January 2007 to 31 January 2007.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 16 years, year of birth 2006 or 2007
If now 20 years, year of birth 2002 or 2003
If now 51 years, year of birth 1971 or 1972

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