Question: when does a boy's voice stop changing
[{'answer': 'the early years of adulthood', 'provenance': [{'wikipedia_id': '34307928', 'title': 'Voice change', 'start_paragraph_id': 4, 'start_character': 126, 'end_paragraph_id': 4, 'end_character': 154, 'bleu_score': 1.0, 'section': 'Section::::Anatomical changes.\n'}]}, {'provenance': [{'wikipedia_id': '34307928', 'title': 'Voice change', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 539, 'bleu_score': 0.940939793195775, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10992327944899051369}, 'section': 'Section::::Anatomical changes.\n'}]}]