137 years old now in 2023 - what year born?

Today, 24 September 2023 if a person is 137 years old now, what year was he born? See below:

If 137 years old, year of birth is:
1885 or 1886*

*It depends on whether he was born before or after 1 January 1886.

If now 137 years and his year of birth 1885 if he was born after 24 September 1885 until 31 december 1885 inclusively, and his year of birth is 1886 if he was born from 1 January 1886 to 24 September 1886.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 12 years, year of birth 2010 or 2011
If now 21 years, year of birth 2001 or 2002
If now 91 years, year of birth 1931 or 1932

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