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However, that's home computers. More and more I'm becoming convinced that the bulk of NN4 visits come from company systems where the IT department is unwilling/unable to upgrade. That's in addition to the schools and libraries we already know about (which are pretty much in the same situation).
This means that browsing from work is the issue, and that will probably not differ across age demographics. We're also not likely to get a good demographic measure on browsing at work by age bracket!
I'd say that 2%-3% on NN4 is probably going to hold true for now.