If you have been self employed or been at a senior management level, you may be able to get a Long Term Business Visa. With this you can set up a business in NZ and when you can show it is successful over a minimum of 2 years, you can then become a Permanent Residence. There is no age limit on this visa.
If you have lots of money (minimum NZ$1,000,000), prove how you got it and how long it took you, you could get Permanent residency. You would have to invest that money in a legitimate NZ investment.