69 years old now in 2025 - what year born?

Today, 16 January 2025 if a person is 69 years old now, what year was he born? See below:

If 69 years old, year of birth is:
1955 or 1956*

*It depends on whether he was born before or after 1 January 1956.

If now 69 years and his year of birth 1955 if he was born after 16 January 1955 until 31 december 1955 inclusively, and his year of birth is 1956 if he was born from 1 January 1956 to 16 January 1956.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 13 years, year of birth 2011 or 2012
If now 19 years, year of birth 2005 or 2006
If now 45 years, year of birth 1979 or 1980

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