110 years old now in 2023 - what year born?

Today, 6 December 2023 if a person is 110 years old now, what year was he born? See below:

If 110 years old, year of birth is:
1912 or 1913*

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

If now 110 years and his year of birth 1912 if he was born after 6 December 1912 until 31 december 1912 inclusively, and his year of birth is 1913 if he was born from 1 January 1913 to 6 December 1913.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 15 years, year of birth 2007 or 2008
If now 19 years, year of birth 2003 or 2004
If now 97 years, year of birth 1925 or 1926

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