55 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 55 years old now, what year was he born? See below:

If 55 years old, year of birth is:
1969 or 1970*

*It depends on whether he was born before or after 1 January 1970.

If now 55 years and his year of birth 1969 if he was born after 19 December 1969 until 31 december 1969 inclusively, and his year of birth is 1970 if he was born from 1 January 1970 to 19 December 1970.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 16 years, year of birth 2008 or 2009
If now 28 years, year of birth 1996 or 1997
If now 75 years, year of birth 1949 or 1950

HTML code:

BB code: