Question: how old was john f. kennedy when he became president
[{'answer': 'age 43', 'provenance': [{'wikipedia_id': '5119376', 'title': 'John F. Kennedy', 'start_paragraph_id': 2, 'start_character': 790, 'end_paragraph_id': 2, 'end_character': 796, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5119376', 'title': 'John F. Kennedy', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 845, 'bleu_score': 0.7608003580400171, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11798555336971513999}, 'section': 'Section::::Abstract.'}]}]