45 years old now in 2025 - what year born?

Today, 16 January 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 16 January 1979 until 31 december 1979 inclusively, and his year of birth is 1980 if he was born from 1 January 1980 to 16 January 1980.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 12 years, year of birth 2012 or 2013
If now 30 years, year of birth 1994 or 1995
If now 36 years, year of birth 1988 or 1989

HTML code:

BB code: