5 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 5 years old now, what year was he born? See below:

If 5 years old, year of birth is:
2020 or 2021*

*It depends on whether he was born before or after 1 January 2021.

If now 5 years and his year of birth 2020 if he was born after 28 October 2020 until 31 december 2020 inclusively, and his year of birth is 2021 if he was born from 1 January 2021 to 28 October 2021.

Other examples:

If now 5 years, year of birth 2020 or 2021
If now 17 years, year of birth 2008 or 2009
If now 23 years, year of birth 2002 or 2003
If now 79 years, year of birth 1946 or 1947

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