Question: who was the oldest signer of the declaration of independance
[{'answer': 'Benjamin Franklin', 'provenance': [{'wikipedia_id': '32226668', 'title': 'Signing of the United States Declaration of Independence', 'start_paragraph_id': 4, 'start_character': 253, 'end_paragraph_id': 4, 'end_character': 270, 'bleu_score': 1.0, 'section': 'Section::::Date of signing.\n'}]}, {'provenance': [{'wikipedia_id': '32226668', 'title': 'Signing of the United States Declaration of Independence', 'start_paragraph_id': 28, 'start_character': 0, 'end_paragraph_id': 28, 'end_character': 436, 'bleu_score': 0.970795021215021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12118619287926862452}, 'section': 'Section::::Signer details.\n'}]}]