Ive not gone through this, but did like "The Last Lecture" - the book, website, and video. Maybe you can do a similar "project" with him - to write down or record some of his life memories, family experience, etc. get his help building out the family tree. Get the children involved (nephews & nieces)...what was it like being a kid during WWI? What did they do w/o video games? Who was his best childhood friend? Childhood toy? If can give him something meaningful to do, to keep going, and get family/friends involved. There's a lifetime of stories to be tapped, many yet untold. My $.02.

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Damn, that's a cold ass honkey.