5 years old now in 2025 - what year born?

Today, 20 March 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 20 March 2019 until 31 december 2019 inclusively, and his year of birth is 2020 if he was born from 1 January 2020 to 20 March 2020.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 14 years, year of birth 2010 or 2011
If now 30 years, year of birth 1994 or 1995
If now 82 years, year of birth 1942 or 1943

HTML code:

BB code: