87 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 87 years old now, what year was he born? See below:

If 87 years old, year of birth is:
1937 or 1938*

*It depends on whether he was born before or after 1 January 1938.

If now 87 years and his year of birth 1937 if he was born after 19 December 1937 until 31 december 1937 inclusively, and his year of birth is 1938 if he was born from 1 January 1938 to 19 December 1938.

Other examples:

If now 8 years, year of birth 2016 or 2017
If now 17 years, year of birth 2007 or 2008
If now 23 years, year of birth 2001 or 2002
If now 31 years, year of birth 1993 or 1994

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