94 years old now in 2023 - what year born?

Today, 1 December 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 1 December 1928 until 31 december 1928 inclusively, and his year of birth is 1929 if he was born from 1 January 1929 to 1 December 1929.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 13 years, year of birth 2009 or 2010
If now 22 years, year of birth 2000 or 2001
If now 63 years, year of birth 1959 or 1960

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