Lord knows I don't want to be difficult, but a great deal depends on whether or not PD is really a single disease or half-a-dozen. There is also some question as to what wemean by "aging". Is it decline in mitochondrial function? Teleomere (sp?) length? Is the 40-yo PWP with raging microglia pumping out cytokines in a different place than an eighty year old who has trouble with buttons? Of course he is. Maybe it isn't "true" aging, but the result seems the same.
Pubmed turns up 65 for "parkinson's" + "accelerated" + "aging"