Question: what age did miley cyrus start hannah montana
[{'answer': 'eleven years old', 'provenance': [{'wikipedia_id': '8135890', 'title': 'Miley Cyrus', 'start_paragraph_id': 14, 'start_character': 88, 'end_paragraph_id': 14, 'end_character': 104, 'bleu_score': 1.0, 'section': 'Section::::Life and career.:2003–2009: "Hannah Montana" and early musical releases.\n'}]}, {'provenance': [{'wikipedia_id': '8135890', 'title': 'Miley Cyrus', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 1139, 'bleu_score': 0.638743968397674, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18291896393460347610}, 'section': 'Section::::Life and career.:2003–2009: "Hannah Montana" and early musical releases.\n'}]}]