121 years old now in 2025 - what year born?

Today, 16 June 2025 if a person is 121 years old now, what year was he born? See below:

If 121 years old, year of birth is:
1903 or 1904*

*It depends on whether he was born before or after 1 January 1904.

If now 121 years and his year of birth 1903 if he was born after 16 June 1903 until 31 december 1903 inclusively, and his year of birth is 1904 if he was born from 1 January 1904 to 16 June 1904.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 14 years, year of birth 2010 or 2011
If now 21 years, year of birth 2003 or 2004
If now 47 years, year of birth 1977 or 1978

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