23 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 23 years old now, what year was he born? See below:

If 23 years old, year of birth is:
1999 or 2000*

*It depends on whether he was born before or after 1 January 2000.

If now 23 years and his year of birth 1999 if he was born after 22 March 1999 until 31 december 1999 inclusively, and his year of birth is 2000 if he was born from 1 January 2000 to 22 March 2000.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 16 years, year of birth 2006 or 2007
If now 27 years, year of birth 1995 or 1996
If now 51 years, year of birth 1971 or 1972

HTML code:

BB code: