Northern or southern MA? Peters Pond Park in Sandwich, MA (Cape) is under new management. Can't remember the name of the company who owned them but it was bad news for a while. Haven't stayed there under the new management but did converse with the owner about a number of things and he seemed like a great guy and very interested in turning the park back into the great campground it used to be. There are lots of cg's on the Cape, Normandy Farms in Foxboro gets great reviews, but there isn't a whole lot on the north shore. The closest thing in between would probably be the KOA in Littleton. None are 55+ tho-I think the closest 55+ is The Bluffs but that's up in Freedom, NH. The majority of the cgs here will have lots of kids.