37 years old now in 2025 - what year born?

Today, 20 March 2025 if a person is 37 years old now, what year was he born? See below:

If 37 years old, year of birth is:
1987 or 1988*

*It depends on whether he was born before or after 1 January 1988.

If now 37 years and his year of birth 1987 if he was born after 20 March 1987 until 31 december 1987 inclusively, and his year of birth is 1988 if he was born from 1 January 1988 to 20 March 1988.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 18 years, year of birth 2006 or 2007
If now 18 years, year of birth 2006 or 2007
If now 61 years, year of birth 1963 or 1964

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