Hi I was dx at age 47 in all probability had started about about 18 months before then shoulder surgery to my left was preformed and bingo first noticeable symptom left arm tremor & found stress made it a whole lot worse.
In some respects I am lucky my dx only took three months and in my view PD is lesser of three evils
1 Brain Tumour ( result could have died)
Essential Tremor ( they know even less about this that they do about PD )
Parkinson's ( Not terminal but will get worse )
It is a battle I fight every single day BUT I will not let it win all the time I can fight it, you will just have to get on with it there is a life before PD and life after PD I consider it a type of bereavement, make sure you are seen every 6 months by your medical team and if there is any problems with your pd in between review's phone your neuro's sec and asked for a med review weather you are on med's or not.
I believe the longer you hold of on meds the harder they have to work when you then start to take them.
Regards BB and good luck.