50 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 50 years old now, what year was he born? See below:

If 50 years old, year of birth is:
1973 or 1974*

*It depends on whether he was born before or after 1 January 1974.

If now 50 years and his year of birth 1973 if he was born after 12 September 1973 until 31 december 1973 inclusively, and his year of birth is 1974 if he was born from 1 January 1974 to 12 September 1974.

Other examples:

If now 10 years, year of birth 2013 or 2014
If now 12 years, year of birth 2011 or 2012
If now 25 years, year of birth 1998 or 1999
If now 100 years, year of birth 1923 or 1924

HTML code:

BB code: