133 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 133 years old now, what year was he born? See below:

If 133 years old, year of birth is:
1891 or 1892*

*It depends on whether he was born before or after 1 January 1892.

If now 133 years and his year of birth 1891 if he was born after 19 December 1891 until 31 december 1891 inclusively, and his year of birth is 1892 if he was born from 1 January 1892 to 19 December 1892.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 14 years, year of birth 2010 or 2011
If now 19 years, year of birth 2005 or 2006
If now 45 years, year of birth 1979 or 1980

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