75 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 75 years old now, what year was he born? See below:

If 75 years old, year of birth is:
1949 or 1950*

*It depends on whether he was born before or after 1 January 1950.

If now 75 years and his year of birth 1949 if he was born after 19 December 1949 until 31 december 1949 inclusively, and his year of birth is 1950 if he was born from 1 January 1950 to 19 December 1950.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 15 years, year of birth 2009 or 2010
If now 23 years, year of birth 2001 or 2002
If now 81 years, year of birth 1943 or 1944

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