56 years old now in 2025 - what year born?

Today, 16 January 2025 if a person is 56 years old now, what year was he born? See below:

If 56 years old, year of birth is:
1968 or 1969*

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

If now 56 years and his year of birth 1968 if he was born after 16 January 1968 until 31 december 1968 inclusively, and his year of birth is 1969 if he was born from 1 January 1969 to 16 January 1969.

Other examples:

If now 8 years, year of birth 2016 or 2017
If now 18 years, year of birth 2006 or 2007
If now 19 years, year of birth 2005 or 2006
If now 59 years, year of birth 1965 or 1966

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