I can tell you about my family- the age of death of the parent with fals is close to the same as the children start symtoms. for example my aunt died at 54 of fals and her oldest two kids are sick now at 54 and 56. my father passed from fals at 64 and I'm 56 and healthy. I have dna test from northwestern I have the mutation and the way it seems to work is I will get it around my father's age. my other aunt passed at 72 of fals her kids are close to 60 and are ok so far-1 other aunt's onset was 65 and is suffering now. does anyone else have this pattern? I also have a uncle in his early 60's that has the mutation and is ok so far. weird deal