137 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 137 years old now, what year was he born? See below:

If 137 years old, year of birth is:
1886 or 1887*

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

If now 137 years and his year of birth 1886 if he was born after 12 September 1886 until 31 december 1886 inclusively, and his year of birth is 1887 if he was born from 1 January 1887 to 12 September 1887.

Other examples:

If now 4 years, year of birth 2019 or 2020
If now 18 years, year of birth 2005 or 2006
If now 28 years, year of birth 1995 or 1996
If now 38 years, year of birth 1985 or 1986

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