Question: how old is nathan chen the olympic skater
[{'answer': '18', 'provenance': [{'wikipedia_id': '26372734', 'title': 'Nathan Chen', 'start_paragraph_id': 1, 'start_character': 141, 'end_paragraph_id': 1, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]