109 years old now in 2022 - what year born?

Today, 1 October 2022 if a person is 109 years old now, what year was he born? See below:

If 109 years old, year of birth is:
1912 or 1913*

*It depends on whether he was born before or after 1 January 1913.

If now 109 years and his year of birth 1912 if he was born after 1 October 1912 until 31 december 1912 inclusively, and his year of birth is 1913 if he was born from 1 January 1913 to 1 October 1913.

Other examples:

If now 3 years, year of birth 2018 or 2019
If now 18 years, year of birth 2003 or 2004
If now 21 years, year of birth 2000 or 2001
If now 69 years, year of birth 1952 or 1953

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