131 years old now in 2023 - what year born?

Today, 7 December 2023 if a person is 131 years old now, what year was he born? See below:

If 131 years old, year of birth is:
1891 or 1892*

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

If now 131 years and his year of birth 1891 if he was born after 7 December 1891 until 31 december 1891 inclusively, and his year of birth is 1892 if he was born from 1 January 1892 to 7 December 1892.

Other examples:

If now 3 years, year of birth 2019 or 2020
If now 13 years, year of birth 2009 or 2010
If now 28 years, year of birth 1994 or 1995
If now 39 years, year of birth 1983 or 1984

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