33 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 33 years old now, what year was he born? See below:

If 33 years old, year of birth is:
1991 or 1992*

*It depends on whether he was born before or after 1 January 1992.

If now 33 years and his year of birth 1991 if he was born after 19 December 1991 until 31 december 1991 inclusively, and his year of birth is 1992 if he was born from 1 January 1992 to 19 December 1992.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 12 years, year of birth 2012 or 2013
If now 27 years, year of birth 1997 or 1998
If now 85 years, year of birth 1939 or 1940

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