Question: when did 18 become the legal age of adulthood in uk
[{'answer': '1970', 'provenance': [{'wikipedia_id': '18207983', 'title': "Timeline of young people's rights in the United Kingdom", 'start_paragraph_id': 4, 'start_character': 251, 'end_paragraph_id': 4, 'end_character': 255, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18207983', 'title': "Timeline of young people's rights in the United Kingdom", 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 588, 'bleu_score': 0.978606533029418, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10338147199772091211}, 'section': 'Section::::Abstract.'}]}]