Question: who plays old ethan in a dogs purpose
[{'answer': 'Dennis Quaid', 'provenance': [{'wikipedia_id': '48359710', 'title': "A Dog's Purpose (film)", 'start_paragraph_id': 1, 'start_character': 401, 'end_paragraph_id': 1, 'end_character': 413, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]