110 years old now in 2025 - what year born?

Today, 20 March 2025 if a person is 110 years old now, what year was he born? See below:

If 110 years old, year of birth is:
1914 or 1915*

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

If now 110 years and his year of birth 1914 if he was born after 20 March 1914 until 31 december 1914 inclusively, and his year of birth is 1915 if he was born from 1 January 1915 to 20 March 1915.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 17 years, year of birth 2007 or 2008
If now 25 years, year of birth 1999 or 2000
If now 56 years, year of birth 1968 or 1969

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