93 years old now in 2023 - what year born?

Today, 7 December 2023 if a person is 93 years old now, what year was he born? See below:

If 93 years old, year of birth is:
1929 or 1930*

*It depends on whether he was born before or after 1 January 1930.

If now 93 years and his year of birth 1929 if he was born after 7 December 1929 until 31 december 1929 inclusively, and his year of birth is 1930 if he was born from 1 January 1930 to 7 December 1930.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 18 years, year of birth 2004 or 2005
If now 23 years, year of birth 1999 or 2000
If now 37 years, year of birth 1985 or 1986

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