Zucchini Flower,
You would help research by taking advantage of the DNA PD project on 23andMe, and find out if you do carry the LRRK2 mutations. You most likely do.
Yes, we are all different. There are no indications in my DNA that would have predicted PD, I even have less than average chance for having PD - but I do, and it started in my early 50s so it is not brought on by an abundance of years.
As an extra treat is has been fascinating to find out that my maternal genes are not Danish at all. Through the maternal line I am related to the Basques, the Berbers and the Finnish Lapps ......... I would never have known that - I thought I was completely generic.