My friends' husband has it. His younger brother died 10 years ago aged 40, and his father also died of it, but not until his 70's.
My friends husband is now 55, he is attending brilliant clinic in Cambridge at Addenbrookes, I can find out more if you like.
My friend's daughters don't want to be tested, one is my goddaughter, she is fine about it but the older one has a big problem with testing and her fathers illness. She is 24.
I have seen my friend's husband deteriorate, she has gone part time to care for him and spend more time with him, although he still works part time himself.
He refused to acknowledge that he may have it, although his wife knew long before it was diagnosed just from the signs. I have known them 23 years, so have seen the changes in him and the family.
I don't really know what else to say, or even if this is useful, but just to say, you are not alone.