He looks back on the book here and mentions that parts of it are now dated.
The ony part that stands out in my memory as dated is that the soldiers' communications-compute devices are called “PDAs.” Now they’d be called “phones.”
The novel is a lesson in marketing. It’s got a good gimmick. The gimmick is that in the far future of the novel, medical science has advanced so that it’s inexpensive to rejuvenate old people and send them out as soldiers.
That kind of gimmick will cause people to pick it up in a bookstore and take a closer look. But a gimmick isn’t enough; the book also has to be good to generate the kinds of reviews and word-of-mouth that really push sales. And Old Man’s War is, indeed, a good book.
