120 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 120 years old now, what year was he born? See below:

If 120 years old, year of birth is:
1905 or 1906*

*It depends on whether he was born before or after 1 January 1906.

If now 120 years and his year of birth 1905 if he was born after 28 October 1905 until 31 december 1905 inclusively, and his year of birth is 1906 if he was born from 1 January 1906 to 28 October 1906.

Other examples:

If now 6 years, year of birth 2019 or 2020
If now 13 years, year of birth 2012 or 2013
If now 24 years, year of birth 2001 or 2002
If now 97 years, year of birth 1928 or 1929

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