55 years old now in 2024 - what year born?

Today, 4 December 2024 if a person is 55 years old now, what year was he born? See below:

If 55 years old, year of birth is:
1968 or 1969*

*It depends on whether he was born before or after 1 January 1969.

If now 55 years and his year of birth 1968 if he was born after 4 December 1968 until 31 december 1968 inclusively, and his year of birth is 1969 if he was born from 1 January 1969 to 4 December 1969.

Other examples:

If now 10 years, year of birth 2013 or 2014
If now 15 years, year of birth 2008 or 2009
If now 20 years, year of birth 2003 or 2004
If now 66 years, year of birth 1957 or 1958

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