54 years old now in 2022 - what year born?

Today, 5 December 2022 if a person is 54 years old now, what year was he born? See below:

If 54 years old, year of birth is:
1967 or 1968*

*It depends on whether he was born before or after 1 January 1968.

If now 54 years and his year of birth 1967 if he was born after 5 December 1967 until 31 december 1967 inclusively, and his year of birth is 1968 if he was born from 1 January 1968 to 5 December 1968.

Other examples:

If now 10 years, year of birth 2011 or 2012
If now 17 years, year of birth 2004 or 2005
If now 24 years, year of birth 1997 or 1998
If now 75 years, year of birth 1946 or 1947

HTML code:

BB code: