Fair play on the age coupled with slow writing issue. I'm not 100% enamored with GRRM myself. I think he ruined Dany as a character in book 5 for example. But there are a lot of things I do like and I do want him to be the one to finish out the series. I know there was a big gap between book 4 and 5; was the gap as big between other books as well?
Looked it up - the first three books came out within a decade. Book 4 then took five years, and 5 took six years. There was a report that as of last month he'd written 200 pages. So here's hoping it's not like the distance between books three and four and four and five. If something does happen (and not due to ill health, necessarily, but just the vagaries of life) I do take comfort that somebody (the show runners) has an overall sketch on how things are to turn out. Not as good as getting a book, but better than nothing.
I'm eager to see Brienne as well.