Question: how old was jackie robinson when he was a rookie
[{'answer': '28', 'provenance': [{'wikipedia_id': '16193', 'title': 'Jackie Robinson', 'start_paragraph_id': 35, 'start_character': 613, 'end_paragraph_id': 35, 'end_character': 615, 'bleu_score': 1.0, 'section': 'Section::::Playing career.:Negro leagues and major league prospects.\n'}]}, {'provenance': [{'wikipedia_id': '16193', 'title': 'Jackie Robinson', 'start_paragraph_id': 46, 'start_character': 3, 'end_paragraph_id': 46, 'end_character': 832, 'bleu_score': 0.7721257971131551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18434046800138009080}, 'section': 'Section::::Playing career.:Major leagues.:Breaking the color barrier (1947).\n'}]}]