these can't have been very thorough checks by either the Taranaki Daily News or the Brooklands Zoo's technical officer. In just five minutes on the internet I found out that the oldest recorded capuchin was almost 55 years old (Hakeem, A., Sandoval, R. G., Jones, M. & Allman, J. 1996. "Brain and life span in primates" In: Handbook of the Psychology of Aging 4th edition (edited by J. E. Birren & K. W. Schaie), pp. 78-104. San Diego: Academic Press). That capuchin is now dead of course, so the Brooklands one could perhaps be the oldest still alive.
Well she is still alive, having just celebrated her 46th Birthday. https://www.facebook.com/BZooNP This says that she was born at Auckland Zoo in 1966, and arrived at Brooklands from Hamilton in 2006.
I have feeling that one of Alma Park's capuchins (or is it spider monkeys?) is claimed to be the oldest in the world. I think he is called Chico or something of that manner.