137 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 137 years old now, what year was he born? See below:

If 137 years old, year of birth is:
1887 or 1888*

*It depends on whether he was born before or after 1 January 1888.

If now 137 years and his year of birth 1887 if he was born after 19 December 1887 until 31 december 1887 inclusively, and his year of birth is 1888 if he was born from 1 January 1888 to 19 December 1888.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 17 years, year of birth 2007 or 2008
If now 18 years, year of birth 2006 or 2007
If now 61 years, year of birth 1963 or 1964

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