101 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 101 years old now, what year was he born? See below:

If 101 years old, year of birth is:
1924 or 1925*

*It depends on whether he was born before or after 1 January 1925.

If now 101 years and his year of birth 1924 if he was born after 28 October 1924 until 31 december 1924 inclusively, and his year of birth is 1925 if he was born from 1 January 1925 to 28 October 1925.

Other examples:

If now 8 years, year of birth 2017 or 2018
If now 15 years, year of birth 2010 or 2011
If now 26 years, year of birth 1999 or 2000
If now 99 years, year of birth 1926 or 1927

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