122 years old now in 2024 - what year born?

Today, 10 October 2024 if a person is 122 years old now, what year was he born? See below:

If 122 years old, year of birth is:
1901 or 1902*

*It depends on whether he was born before or after 1 January 1902.

If now 122 years and his year of birth 1901 if he was born after 10 October 1901 until 31 december 1901 inclusively, and his year of birth is 1902 if he was born from 1 January 1902 to 10 October 1902.

Other examples:

If now 7 years, year of birth 2016 or 2017
If now 18 years, year of birth 2005 or 2006
If now 26 years, year of birth 1997 or 1998
If now 52 years, year of birth 1971 or 1972

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