I like to miss commas every now and then. My spelling has gotten a lot worse as I got older. I used to be able to spell just about anything, not so much anymore - and I find myself spell checking even simple words I used to know so so well. Oh well. I blame TV.
As for writing, I think on a good day I was able to get about 35 pages, double spaced. I think now I can type out maybe a good 3 to 5. But that's not an 8 to 12 hour writing shift. That's in somewhere between 1 - 4 hours. Work writing I can pump out in about 20 minutes. The more complicated stuff can take an hour...and that's usually about 1 or 2 pages.