36 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 36 years old now, what year was he born? See below:

If 36 years old, year of birth is:
1988 or 1989*

*It depends on whether he was born before or after 1 January 1989.

If now 36 years and his year of birth 1988 if he was born after 19 December 1988 until 31 december 1988 inclusively, and his year of birth is 1989 if he was born from 1 January 1989 to 19 December 1989.

Other examples:

If now 8 years, year of birth 2016 or 2017
If now 14 years, year of birth 2010 or 2011
If now 25 years, year of birth 1999 or 2000
If now 72 years, year of birth 1952 or 1953

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