131 years old now in 2025 - what year born?

Today, 24 April 2025 if a person is 131 years old now, what year was he born? See below:

If 131 years old, year of birth is:
1893 or 1894*

*It depends on whether he was born before or after 1 January 1894.

If now 131 years and his year of birth 1893 if he was born after 24 April 1893 until 31 december 1893 inclusively, and his year of birth is 1894 if he was born from 1 January 1894 to 24 April 1894.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 18 years, year of birth 2006 or 2007
If now 30 years, year of birth 1994 or 1995
If now 75 years, year of birth 1949 or 1950

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