The general belief is that PD is a universally progressive illness....so, over time, patients typically get worse.
Having said that, the speed of progression varies widely between patients. in fact, just yesterday I saw a patient, who I still believe has PD, but has had minimal progression in the last 7 years. Now this is not typical and probably exceptional, but it does exists.
Your PD seems to be very slow and benign. In many ways, you should count your blessings! Happy holidays!