Yesterday the alumni magazine from my alma mater came in the mail. Reading it through, I discovered that an old professor of mine died a few months ago. He was pushing 90, and in ill health; still, it comes as a shock. When I had him for several classes in graduate school, he was only a few years older than I am now. I remember that to me, then in my early 20s, he seemed positively ancient.
He was a great guy. A good teacher too. And well known in his field, not only for his research but also for a couple of textbooks he wrote which are still widely used. I'm sure I've got one of them on the shelf somewhere around the house here.
Requiescat in pace.