105 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 105 years old now, what year was he born? See below:

If 105 years old, year of birth is:
1920 or 1921*

*It depends on whether he was born before or after 1 January 1921.

If now 105 years and his year of birth 1920 if he was born after 28 October 1920 until 31 december 1920 inclusively, and his year of birth is 1921 if he was born from 1 January 1921 to 28 October 1921.

Other examples:

If now 3 years, year of birth 2022 or 2023
If now 16 years, year of birth 2009 or 2010
If now 23 years, year of birth 2002 or 2003
If now 43 years, year of birth 1982 or 1983

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