Earlier quoted context omitted.
It really, really depends on your site's demographic. Example: skin care website, they sell women's beauty and anti aging products. Their demographic is 15% IE8, but you know who are most likely to buy their products? Mature women, who are also more likely to be the ones in that 15%. The next part of that puzzle was when they launched into China. China has a huge population still on XP and IE8. Literally millions of…
I would think mature women would be the ones more likely to be using an iPad/iPhone. I've worked in several positions where the demographics are skewed towards middle age, and the use of the iPad alone is far larger than IE<11.
This isn't to say the majority of mature women use IE8 or that only mature women use IE8, just that they were over-represented inside that 15% and they were purchasing customers.
You are right that iPads and iPhones are the majority of their demographic.