Question: who is the oldest person to have a baby naturally
[{'answer': '71 years', 'provenance': [{'wikipedia_id': '1151454', 'title': 'Pregnancy over age 50', 'start_paragraph_id': 4, 'start_character': 43, 'end_paragraph_id': 4, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1151454', 'title': 'Pregnancy over age 50', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 305, 'bleu_score': 0.9632870032952191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2324436326657630981}, 'section': 'Section::::Abstract.'}]}]