I read somewhere (not very helpful, I know) that they're coming up with more early detection methods
The problem is there don't seem to be any real treatments yet. They can compensate for downstream issues like death of dopaminergic neurons, but it doesn't at all mitigate the root cause(s)
Whether it's detected at age 20 or age 90, I think you're basically just fucked. Unless you're young enough that maybe you won't get too old/damaged before a real treatment or cure is available