55 years old now in 2025 - what year born?

Today, 24 April 2025 if a person is 55 years old now, what year was he born? See below:

If 55 years old, year of birth is:
1969 or 1970*

*It depends on whether he was born before or after 1 January 1970.

If now 55 years and his year of birth 1969 if he was born after 24 April 1969 until 31 december 1969 inclusively, and his year of birth is 1970 if he was born from 1 January 1970 to 24 April 1970.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 13 years, year of birth 2011 or 2012
If now 21 years, year of birth 2003 or 2004
If now 43 years, year of birth 1981 or 1982

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