I think there is something about 7 years, but I think that's a bit of a myth too, although I'm no expert either and stand to be corrected :-)I thought ( may be wrong, usually am :)), as long as you live a further 5 years after, then that’s ok?
I do understand why it pisses people off though. You work hard, you save and you do things "correctly" yet then possibly have it all taken away. Yet the other thing I do "get" is that if your assets aren't used then the bill ultimately falls on everyone else.
My mum was in care for the last 20 odd years of her life due to schizophrenia and then, in the final few years, dementia. Her assets weren't taken, so there seems to be a different rule for that although I think it was the schizophrenia and being sectioned rather than anything else.