2 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 2 years old now, what year was he born? See below:

If 2 years old, year of birth is:
2020 or 2021*

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

If now 2 years and his year of birth 2020 if he was born after 22 March 2020 until 31 december 2020 inclusively, and his year of birth is 2021 if he was born from 1 January 2021 to 22 March 2021.

Other examples:

If now 7 years, year of birth 2015 or 2016
If now 16 years, year of birth 2006 or 2007
If now 24 years, year of birth 1998 or 1999
If now 73 years, year of birth 1949 or 1950

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