More mobile phones than people

Peter Griffin blogs the Telecom profit announcement.

found it interesting that NZ now has more phones than people.  This it seems is because of people like me who have a work and a private phone – one with Telecom and one with .

It would be interesting to see any stats, if they exist, on mobile penetration by age range.  Most kids seem to get a phone once they are ten or so now.  I've also noticed more and more retired people  taking up a phone.