22 years old now in 2023 - what year born?

Today, 26 September 2023 if a person is 22 years old now, what year was he born? See below:

If 22 years old, year of birth is:
2000 or 2001*

*It depends on whether he was born before or after 1 January 2001.

If now 22 years and his year of birth 2000 if he was born after 26 September 2000 until 31 december 2000 inclusively, and his year of birth is 2001 if he was born from 1 January 2001 to 26 September 2001.

Other examples:

If now 10 years, year of birth 2012 or 2013
If now 12 years, year of birth 2010 or 2011
If now 29 years, year of birth 1993 or 1994
If now 82 years, year of birth 1940 or 1941

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