122 years old now in 2023 - what year born?

Today, 26 March 2023 if a person is 122 years old now, what year was he born? See below:

If 122 years old, year of birth is:
1900 or 1901*

*It depends on whether he was born before or after 1 January 1901.

If now 122 years and his year of birth 1900 if he was born after 26 March 1900 until 31 december 1900 inclusively, and his year of birth is 1901 if he was born from 1 January 1901 to 26 March 1901.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 18 years, year of birth 2004 or 2005
If now 20 years, year of birth 2002 or 2003
If now 77 years, year of birth 1945 or 1946

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