5 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 5 years old now, what year was he born? See below:

If 5 years old, year of birth is:
2019 or 2020*

*It depends on whether he was born before or after 1 January 2020.

If now 5 years and his year of birth 2019 if he was born after 19 December 2019 until 31 december 2019 inclusively, and his year of birth is 2020 if he was born from 1 January 2020 to 19 December 2020.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 18 years, year of birth 2006 or 2007
If now 23 years, year of birth 2001 or 2002
If now 57 years, year of birth 1967 or 1968

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