87 years old now in 2025 - what year born?

Today, 20 March 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 20 March 1937 until 31 december 1937 inclusively, and his year of birth is 1938 if he was born from 1 January 1938 to 20 March 1938.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 12 years, year of birth 2012 or 2013
If now 26 years, year of birth 1998 or 1999
If now 54 years, year of birth 1970 or 1971

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