Hi Kerry,
My 49 yrs old father has had BFS for a year-and-a-half now. He's doing just fine. As a matter of fact, maybe better than ever! He has through a lot of self-persuation and tutoring finally managed to forget and not worry about his twitches! Of course he, as me, went through the obligatory ALS-scare, but now he's living his life as always. He's in the French Alps right now with my mother, and this summer they' re both going to South America for 5 weeks of climbing, trekking & experiencing! So I think it's fair to say that despite 18 months of BFS, it has had no life-threatening or disabling effect on my grand old man whatsoever!
Luck to you all,
Daniel