143 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 143 years old now, what year was he born? See below:

If 143 years old, year of birth is:
1880 or 1881*

*It depends on whether he was born before or after 1 January 1881.

If now 143 years and his year of birth 1880 if he was born after 15 October 1880 until 31 december 1880 inclusively, and his year of birth is 1881 if he was born from 1 January 1881 to 15 October 1881.

Other examples:

If now 12 years, year of birth 2011 or 2012
If now 14 years, year of birth 2009 or 2010
If now 29 years, year of birth 1994 or 1995
If now 43 years, year of birth 1980 or 1981

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