3 years old now in 2023 - what year born?

Today, 29 May 2023 if a person is 3 years old now, what year was he born? See below:

If 3 years old, year of birth is:
2019 or 2020*

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

If now 3 years and his year of birth 2019 if he was born after 29 May 2019 until 31 december 2019 inclusively, and his year of birth is 2020 if he was born from 1 January 2020 to 29 May 2020.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 13 years, year of birth 2009 or 2010
If now 22 years, year of birth 2000 or 2001
If now 45 years, year of birth 1977 or 1978

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