30 years old now in 2025 - what year born?

Today, 19 December 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 December 1994 until 31 december 1994 inclusively, and his year of birth is 1995 if he was born from 1 January 1995 to 19 December 1995.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 18 years, year of birth 2006 or 2007
If now 21 years, year of birth 2003 or 2004
If now 88 years, year of birth 1936 or 1937

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