108 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 108 years old now, what year was he born? See below:

If 108 years old, year of birth is:
1914 or 1915*

*It depends on whether he was born before or after 1 January 1915.

If now 108 years and his year of birth 1914 if he was born after 1 December 1914 until 31 december 1914 inclusively, and his year of birth is 1915 if he was born from 1 January 1915 to 1 December 1915.

Other examples:

If now 7 years, year of birth 2015 or 2016
If now 12 years, year of birth 2010 or 2011
If now 22 years, year of birth 2000 or 2001
If now 39 years, year of birth 1983 or 1984

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