142 years old now in 2023 - what year born?

Today, 26 September 2023 if a person is 142 years old now, what year was he born? See below:

If 142 years old, year of birth is:
1880 or 1881*

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

If now 142 years and his year of birth 1880 if he was born after 26 September 1880 until 31 december 1880 inclusively, and his year of birth is 1881 if he was born from 1 January 1881 to 26 September 1881.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 15 years, year of birth 2007 or 2008
If now 24 years, year of birth 1998 or 1999
If now 94 years, year of birth 1928 or 1929

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