69 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1955 until 31 december 1955 inclusively, and his year of birth is 1956 if he was born from 1 January 1956 to 19 December 1956.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 15 years, year of birth 2009 or 2010
If now 25 years, year of birth 1999 or 2000
If now 36 years, year of birth 1988 or 1989

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