I don't know anyone on this board.
From the stuff I've read / heard on the radio about China, it's this burgeoning 20-40 age group that are lapping up "western" luxury goods. There was a good half hour about it this morning on Radio 5, talking about Land Rover production and Chinese sales. Yes, I'd say most people I know with iPhones are 20 - 40. I know two owners that are 60 odd, one from the pub, and one being one of my mates from school's dad. Both of those are jailbroken by the way.
You obviously know little on the subject, so dismissing what I'm saying is a little arrogant.

I'm not saying it has a huge impact on aggregate sales, but it certainly has some. Especially when you consider the China angle.
I know for a fact, there are people I know who have not upgraded to an iPhone 5 because they can't jailbreak them. This includes everyone I know with an iPhone 4, who should really be on their natural upgrade cycle.
Similarly I know people who haven't upgraded to an ATV3 because there's no jailbreak. I held out for ages not buying one umming an arring about if I should buy a used ATV2 instead. You've only got to look at the used prices to see how that effects ATV3 sales. I know 5 people (including my ATV 3) with an ATV. 3 of them are ATV2s. 2 of them are jailbroken and are on 1080p TVs.