86 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 86 years old now, what year was he born? See below:

If 86 years old, year of birth is:
1936 or 1937*

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

If now 86 years and his year of birth 1936 if he was born after 22 March 1936 until 31 december 1936 inclusively, and his year of birth is 1937 if he was born from 1 January 1937 to 22 March 1937.

Other examples:

If now 6 years, year of birth 2016 or 2017
If now 15 years, year of birth 2007 or 2008
If now 20 years, year of birth 2002 or 2003
If now 93 years, year of birth 1929 or 1930

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