123 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 123 years old now, what year was he born? See below:

If 123 years old, year of birth is:
1902 or 1903*

*It depends on whether he was born before or after 1 January 1903.

If now 123 years and his year of birth 1902 if he was born after 28 October 1902 until 31 december 1902 inclusively, and his year of birth is 1903 if he was born from 1 January 1903 to 28 October 1903.

Other examples:

If now 12 years, year of birth 2013 or 2014
If now 17 years, year of birth 2008 or 2009
If now 20 years, year of birth 2005 or 2006
If now 80 years, year of birth 1945 or 1946

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