12 years old now in 2025 - what year born?

Today, 16 June 2025 if a person is 12 years old now, what year was he born? See below:

If 12 years old, year of birth is:
2012 or 2013*

*It depends on whether he was born before or after 1 January 2013.

If now 12 years and his year of birth 2012 if he was born after 16 June 2012 until 31 december 2012 inclusively, and his year of birth is 2013 if he was born from 1 January 2013 to 16 June 2013.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 15 years, year of birth 2009 or 2010
If now 24 years, year of birth 2000 or 2001
If now 88 years, year of birth 1936 or 1937

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