118 years old now in 2025 - what year born?

Today, 8 July 2025 if a person is 118 years old now, what year was he born? See below:

If 118 years old, year of birth is:
1906 or 1907*

*It depends on whether he was born before or after 1 January 1907.

If now 118 years and his year of birth 1906 if he was born after 8 July 1906 until 31 december 1906 inclusively, and his year of birth is 1907 if he was born from 1 January 1907 to 8 July 1907.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 18 years, year of birth 2006 or 2007
If now 18 years, year of birth 2006 or 2007
If now 51 years, year of birth 1973 or 1974

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