8 years old now in 2025 - what year born?

Today, 18 January 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 18 January 2016 until 31 december 2016 inclusively, and his year of birth is 2017 if he was born from 1 January 2017 to 18 January 2017.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 12 years, year of birth 2012 or 2013
If now 30 years, year of birth 1994 or 1995
If now 55 years, year of birth 1969 or 1970

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