That is Native. Here in southern New England, it's a known style, but not the most common style. What Mark posted shows the more common style here, which is a triangle, or triangle with perforation.
The age depends on where you found it in the Northeast, because the tribes persisted for longer period of time in some areas then in others. For instance, if that were found in southern New England, it would likely be from the 17th century, no later then King Philip's War of 1675-76. But, natives lived freely longer in New York and Pa., for example, and there it could date to the 1700's. Either way, it can, and most likely is, more then 200 years old, and if from the early 1600's, could be closer to 400 years old.
The English traded brass and copper kettles to natives here, and the men cut that thin sheet metal up and made points out of them. I love finding trade points where I live, but only have two as personal finds. I think that is a great find.