New Zealand's Superfund celebrates its 20th anniversary today, as Baby Boomers hit retirement age. Former Minister of Finance, Sir Michael Cullen established the fund on October 11th 2001, in anticipation of a bulge in an aging population reitiring. The Government started withdrawing from the Fund last year. It's set to keep growing for many decades, having started with an initial contribution from the government of $2.4 billion. Currently it's worth $60bn. CEO of the Superfund Matt Whineray talks to Kathryn Ryan.