76 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 76 years old now, what year was he born? See below:

If 76 years old, year of birth is:
1948 or 1949*

*It depends on whether he was born before or after 1 January 1949.

If now 76 years and his year of birth 1948 if he was born after 19 December 1948 until 31 december 1948 inclusively, and his year of birth is 1949 if he was born from 1 January 1949 to 19 December 1949.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 13 years, year of birth 2011 or 2012
If now 25 years, year of birth 1999 or 2000
If now 80 years, year of birth 1944 or 1945

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