41 years old now in 2025 - what year born?

Today, 8 July 2025 if a person is 41 years old now, what year was he born? See below:

If 41 years old, year of birth is:
1983 or 1984*

*It depends on whether he was born before or after 1 January 1984.

If now 41 years and his year of birth 1983 if he was born after 8 July 1983 until 31 december 1983 inclusively, and his year of birth is 1984 if he was born from 1 January 1984 to 8 July 1984.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 18 years, year of birth 2006 or 2007
If now 26 years, year of birth 1998 or 1999
If now 100 years, year of birth 1924 or 1925

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