Question: how old was sasuke when his clan died
[{'answer': 'seven', 'provenance': [{'wikipedia_id': '740107', 'title': 'Sasuke Uchiha', 'start_paragraph_id': 25, 'start_character': 662, 'end_paragraph_id': 25, 'end_character': 667, 'bleu_score': 1.0, 'section': 'Section::::Appearances.:In "Naruto".:In Part I.\n'}]}, {'provenance': [{'wikipedia_id': '740107', 'title': 'Sasuke Uchiha', 'start_paragraph_id': 25, 'start_character': 55, 'end_paragraph_id': 25, 'end_character': 890, 'bleu_score': 0.883768070390034, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9238914499825617540}, 'section': 'Section::::Appearances.:In "Naruto".:In Part I.\n'}]}, {'provenance': [{'wikipedia_id': '740107', 'title': 'Sasuke Uchiha', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9238914499825617540}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '740107', 'title': 'Sasuke Uchiha', 'section': 'Section::::Appearances.:In "Naruto".:In Part I.\n', 'start_paragraph_id': 25, 'end_paragraph_id': 25, 'meta': {'evidence_span': ['He, at the age of seven, survived the massacre of his clan perpetrated by his brother, Itachi', 'Sasuke is introduced in the third chapter of "Naruto"s manga as a young ninja assigned to become a member of Team\xa07 alongside his rival Naruto Uzumaki and Sakura Haruno, the latter of whom is infatuated with him. The trio are trained under the guidance of Kakashi Hatake. Although Sasuke is antisocial, cold and distant, he starts caring about Naruto and Sakura. During a mission, Sasuke awakens his Sharingan his clan\'s inherited ability to see through illusions which allows him to learn imperceptible movements at a superhuman rate. It is revealed later that Sasuke is the sole survivor of the once-powerful Uchiha clan of Konohagakure. He, at the age of seven, survived the massacre of his clan perpetrated by his brother, Itachi, who spared Sasuke\'s life because he did not consider him worth killing. Sasuke seeks strong fighting opponents to reassure himself his power is growing.\rhighlight sentence(s) containing evidence, not only the answer', 'He, at the age of seven, survived the massacre of his clan']}}]}]