30 years old now in 2025 - what year born?

Today, 19 March 2025 if a person is 30 years old now, what year was he born? See below:

If 30 years old, year of birth is:
1994 or 1995*

*It depends on whether he was born before or after 1 January 1995.

If now 30 years and his year of birth 1994 if he was born after 19 March 1994 until 31 december 1994 inclusively, and his year of birth is 1995 if he was born from 1 January 1995 to 19 March 1995.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 18 years, year of birth 2006 or 2007
If now 27 years, year of birth 1997 or 1998
If now 73 years, year of birth 1951 or 1952

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