I consider Steve as the expert here. My understanding is that, of the songs collected in the late 1800s and early 1900s and sung nowadays in the revival, the largest proportion started life in the 1700s but most of the rest in the 1800s. (A few even come from the early 1900s, such as "We'll All Go A-Hunting Today", Roud 1172.) Not a lot go back before 1700 in anything like their present forms, though some of the ballads tell stories that are older.
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