4 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 4 years old now, what year was he born? See below:

If 4 years old, year of birth is:
2021 or 2022*

*It depends on whether he was born before or after 1 January 2022.

If now 4 years and his year of birth 2021 if he was born after 28 October 2021 until 31 december 2021 inclusively, and his year of birth is 2022 if he was born from 1 January 2022 to 28 October 2022.

Other examples:

If now 4 years, year of birth 2021 or 2022
If now 18 years, year of birth 2007 or 2008
If now 24 years, year of birth 2001 or 2002
If now 89 years, year of birth 1936 or 1937

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