I'm 25, and I have two decent sized bookshelves worth of dead tree books. It's probably about 1/3 textbooks and technical stuff (including old binders full of papers) and then whatever other novels and nonfiction I've accumulated. The textbooks usually can't be found in a library and a fair portion of the balance is $1 and $2 stuff I've picked up at used book stores or yard sales. I prefer print copies to PDFs. I can scribble in the margins or take it outside with me. I also don't get distracted as much by the wonder of the internet if it's not on a computer.
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