37 years old now in 2023 - what year born?

Today, 29 May 2023 if a person is 37 years old now, what year was he born? See below:

If 37 years old, year of birth is:
1985 or 1986*

*It depends on whether he was born before or after 1 January 1986.

If now 37 years and his year of birth 1985 if he was born after 29 May 1985 until 31 december 1985 inclusively, and his year of birth is 1986 if he was born from 1 January 1986 to 29 May 1986.

Other examples:

If now 7 years, year of birth 2015 or 2016
If now 12 years, year of birth 2010 or 2011
If now 22 years, year of birth 2000 or 2001
If now 38 years, year of birth 1984 or 1985

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