10 years old now in 2025 - what year born?

Today, 8 July 2025 if a person is 10 years old now, what year was he born? See below:

If 10 years old, year of birth is:
2014 or 2015*

*It depends on whether he was born before or after 1 January 2015.

If now 10 years and his year of birth 2014 if he was born after 8 July 2014 until 31 december 2014 inclusively, and his year of birth is 2015 if he was born from 1 January 2015 to 8 July 2015.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 14 years, year of birth 2010 or 2011
If now 30 years, year of birth 1994 or 1995
If now 39 years, year of birth 1985 or 1986

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