87 years old now in 2023 - what year born?

Today, 27 March 2023 if a person is 87 years old now, what year was he born? See below:

If 87 years old, year of birth is:
1935 or 1936*

*It depends on whether he was born before or after 1 January 1936.

If now 87 years and his year of birth 1935 if he was born after 27 March 1935 until 31 december 1935 inclusively, and his year of birth is 1936 if he was born from 1 January 1936 to 27 March 1936.

Other examples:

If now 4 years, year of birth 2018 or 2019
If now 15 years, year of birth 2007 or 2008
If now 20 years, year of birth 2002 or 2003
If now 52 years, year of birth 1970 or 1971

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