People who think 60% is too low haven't met a young person in a while, I think... virtually everyone in every class I teach uses Apple computers or tablets; I'm absolutely not surprised that's where most of the change has gone, at least for personal use. (And in the US specifically)

That said, I'd have thought the 30% mac share was earlier than 2010, this suggests that it's more recent? Apple might as well been running a psyop to get young people to use their products since the 90s. I remember when I was in middle school, they "generously" donated a lab full of those colorful iMacs to my school. Seems it might have been the first computer many of my peers had even touched, too.