94 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 94 years old now, what year was he born? See below:

If 94 years old, year of birth is:
1928 or 1929*

*It depends on whether he was born before or after 1 January 1929.

If now 94 years and his year of birth 1928 if he was born after 22 March 1928 until 31 december 1928 inclusively, and his year of birth is 1929 if he was born from 1 January 1929 to 22 March 1929.

Other examples:

If now 4 years, year of birth 2018 or 2019
If now 18 years, year of birth 2004 or 2005
If now 29 years, year of birth 1993 or 1994
If now 84 years, year of birth 1938 or 1939

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