45 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 45 years old now, what year was he born? See below:

If 45 years old, year of birth is:
1979 or 1980*

*It depends on whether he was born before or after 1 January 1980.

If now 45 years and his year of birth 1979 if he was born after 19 December 1979 until 31 december 1979 inclusively, and his year of birth is 1980 if he was born from 1 January 1980 to 19 December 1980.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 14 years, year of birth 2010 or 2011
If now 23 years, year of birth 2001 or 2002
If now 59 years, year of birth 1965 or 1966

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