Hero to every geek, most likely, and certainly one of mine.
90 isn’t a bad age for anyone, I think, and if you happen to be able meld science fiction and “real” science for most of that time, unbeatable. I think the fact that he wrote sci-fi that was so fact-checked and rigourous that it forms the basis of modern life is inspirational on so many levels. (Like now, sat in a hotel, using a phone to make a connection, seems like a very “Arthur moment” ;)
To infinity and beyond, brother!