My wife, 69 yo, has has PD for 16 years now. She was disqualified from DBS because she has delusions and hallucinations. She takes Rytary instead of Sinemet and that makes a big difference in allowing her to move longer even though her psychosis is a real problem.
At your young age, I would really consider DBS before psychosis kicks in. The more L-Dopa you take, the greater chance of psychosis.