45 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 45 years old now, what year was he born? See below:

If 45 years old, year of birth is:
1980 or 1981*

*It depends on whether he was born before or after 1 January 1981.

If now 45 years and his year of birth 1980 if he was born after 28 October 1980 until 31 december 1980 inclusively, and his year of birth is 1981 if he was born from 1 January 1981 to 28 October 1981.

Other examples:

If now 9 years, year of birth 2016 or 2017
If now 15 years, year of birth 2010 or 2011
If now 27 years, year of birth 1998 or 1999
If now 90 years, year of birth 1935 or 1936

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