138 years old now in 2024 - what year born?

Today, 10 October 2024 if a person is 138 years old now, what year was he born? See below:

If 138 years old, year of birth is:
1885 or 1886*

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

If now 138 years and his year of birth 1885 if he was born after 10 October 1885 until 31 december 1885 inclusively, and his year of birth is 1886 if he was born from 1 January 1886 to 10 October 1886.

Other examples:

If now 12 years, year of birth 2011 or 2012
If now 18 years, year of birth 2005 or 2006
If now 18 years, year of birth 2005 or 2006
If now 89 years, year of birth 1934 or 1935

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