Question: how old was riggs when he played king
[{'answer': '55', 'provenance': [{'wikipedia_id': '6531362', 'title': 'Battle of the Sexes (tennis)', 'start_paragraph_id': 1, 'start_character': 313, 'end_paragraph_id': 1, 'end_character': 315, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6531362', 'title': 'Battle of the Sexes (tennis)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 581, 'bleu_score': 0.915001303192125, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5754460851320955067}, 'section': 'Section::::Abstract.'}]}]