I am sorry that you are worried. And I know it must be so frustrating to be seeking an answer to your symptoms. You are correct in that everyone is different. And unfortunately it just can't be predicted how long each symptom will last.
You are around my age. I was diagnosed around two years ago. It wasn't late onset though, but just diagnosed late.
Hang in there...not very good advice I know

...but at least know you are not alone. Come on here and talk anytime you need someone to listen!