136 years old now in 2023 - what year born?

Today, 26 September 2023 if a person is 136 years old now, what year was he born? See below:

If 136 years old, year of birth is:
1886 or 1887*

*It depends on whether he was born before or after 1 January 1887.

If now 136 years and his year of birth 1886 if he was born after 26 September 1886 until 31 december 1886 inclusively, and his year of birth is 1887 if he was born from 1 January 1887 to 26 September 1887.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 17 years, year of birth 2005 or 2006
If now 24 years, year of birth 1998 or 1999
If now 100 years, year of birth 1922 or 1923

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