109 years old now in 2025 - what year born?

Today, 19 March 2025 if a person is 109 years old now, what year was he born? See below:

If 109 years old, year of birth is:
1915 or 1916*

*It depends on whether he was born before or after 1 January 1916.

If now 109 years and his year of birth 1915 if he was born after 19 March 1915 until 31 december 1915 inclusively, and his year of birth is 1916 if he was born from 1 January 1916 to 19 March 1916.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 17 years, year of birth 2007 or 2008
If now 24 years, year of birth 2000 or 2001
If now 68 years, year of birth 1956 or 1957

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