user: Question: How old was the official with Chinese name  孫明揚?
Columns: ['Romanised name', 'Chinese name', 'age at appointment', 'Portfolio', 'Prior occupation']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['Donald Tsang Yam-kuen', '曾蔭權', 58.0, 'Chief Secretary for Administration (CS)', 'Chief Secretary for Administration (CS)']
SQL:

assistant: SELECT "age at appointment" FROM "Table" WHERE "Chinese name" = '孫明揚';