56 years old now in 2025 - what year born?

Today, 24 April 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 24 April 1968 until 31 december 1968 inclusively, and his year of birth is 1969 if he was born from 1 January 1969 to 24 April 1969.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 13 years, year of birth 2011 or 2012
If now 20 years, year of birth 2004 or 2005
If now 76 years, year of birth 1948 or 1949

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