He had aged considerably over the past few years - I was looking at pictures of him taken since 1993 (moving on throughout the years, up until last July), and there was a distinct difference beginning around 2004 or so. He looked grayer, his hair was thinning, he was putting on more weight around his waist, and his face just looked more careworn. He was still the same droll, witty, curmudgeonly personality; but looking back at it, it's pretty clear that something was changing physically with him.