My sister in law has it.Yes, I do.
There are many degrees and mine, though I would by no means say mild, is nearer that end of the scale.
Amongst the biggest struggles I face are my right hand side is much weaker than my left, I have difficulty walking, have very poor balance and I am very clumsy and drop or spill things all the time.
she is 46 and in the last year or so her ability to walk (which needs a walker) is getting worse and worse -she gets stressed and the messages stop getting to her legs and she freezes.
Its quite a worry because she is almost at the point where she needs a wheelchair.
As far as I know its not degenerative, but it does seem mobility gets worse in later life -have you experienced the same?