6 years old now in 2025 - what year born?

Today, 16 January 2025 if a person is 6 years old now, what year was he born? See below:

If 6 years old, year of birth is:
2018 or 2019*

*It depends on whether he was born before or after 1 January 2019.

If now 6 years and his year of birth 2018 if he was born after 16 January 2018 until 31 december 2018 inclusively, and his year of birth is 2019 if he was born from 1 January 2019 to 16 January 2019.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 13 years, year of birth 2011 or 2012
If now 30 years, year of birth 1994 or 1995
If now 62 years, year of birth 1962 or 1963

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