8 years old now in 2025 - what year born?

Today, 8 July 2025 if a person is 8 years old now, what year was he born? See below:

If 8 years old, year of birth is:
2016 or 2017*

*It depends on whether he was born before or after 1 January 2017.

If now 8 years and his year of birth 2016 if he was born after 8 July 2016 until 31 december 2016 inclusively, and his year of birth is 2017 if he was born from 1 January 2017 to 8 July 2017.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 17 years, year of birth 2007 or 2008
If now 24 years, year of birth 2000 or 2001
If now 31 years, year of birth 1993 or 1994

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