Question: how old was the shooter in the florida massacre
[{'answer': '19', 'provenance': [{'wikipedia_id': '56589491', 'title': 'Stoneman Douglas High School shooting', 'start_paragraph_id': 2, 'start_character': 230, 'end_paragraph_id': 2, 'end_character': 232, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]