Anyone got mums and dads who've immigrated to NZ and are retirement age?

If so can anyone confirm whether the Old Age Pension (can't they think of a better term for it ??) is subject to tax in NZ? ?I'm talking about a pension that would come from the UK as we won't have been in NZ long enough to qualify for theirs. ?They give us precious little as it is, so if NZ taxes us as well that puts a sting in the tail, especially as we won't even get the annual increments either.