76 years old now in 2025 - what year born?

Today, 18 January 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 18 January 1948 until 31 december 1948 inclusively, and his year of birth is 1949 if he was born from 1 January 1949 to 18 January 1949.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 12 years, year of birth 2012 or 2013
If now 19 years, year of birth 2005 or 2006
If now 69 years, year of birth 1955 or 1956

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