17 years old now in 2025 - what year born?

Today, 16 June 2025 if a person is 17 years old now, what year was he born? See below:

If 17 years old, year of birth is:
2007 or 2008*

*It depends on whether he was born before or after 1 January 2008.

If now 17 years and his year of birth 2007 if he was born after 16 June 2007 until 31 december 2007 inclusively, and his year of birth is 2008 if he was born from 1 January 2008 to 16 June 2008.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 15 years, year of birth 2009 or 2010
If now 26 years, year of birth 1998 or 1999
If now 53 years, year of birth 1971 or 1972

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