138 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 138 years old now, what year was he born? See below:

If 138 years old, year of birth is:
1887 or 1888*

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

If now 138 years and his year of birth 1887 if he was born after 28 October 1887 until 31 december 1887 inclusively, and his year of birth is 1888 if he was born from 1 January 1888 to 28 October 1888.

Other examples:

If now 12 years, year of birth 2013 or 2014
If now 18 years, year of birth 2007 or 2008
If now 21 years, year of birth 2004 or 2005
If now 69 years, year of birth 1956 or 1957

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