87 years old now in 2024 - what year born?

Today, 4 December 2024 if a person is 87 years old now, what year was he born? See below:

If 87 years old, year of birth is:
1936 or 1937*

*It depends on whether he was born before or after 1 January 1937.

If now 87 years and his year of birth 1936 if he was born after 4 December 1936 until 31 december 1936 inclusively, and his year of birth is 1937 if he was born from 1 January 1937 to 4 December 1937.

Other examples:

If now 7 years, year of birth 2016 or 2017
If now 12 years, year of birth 2011 or 2012
If now 29 years, year of birth 1994 or 1995
If now 44 years, year of birth 1979 or 1980

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