Yes, you should have read DLD & Quantum of Nightmares before you tackle this one. You should be fine at that point -- I've forgotten many of the earlier books, but everything made sense to me as I went. Stross also includes those helpful reminders at the end, linking some characters back to earlier books.

I don't have senior moments . . . I have senior afternoons, evenings, & occasional overnights. Of course, I turned 60 a little while back . . . ahem. Happy early birthday!