CREATE TABLE table_25183 ("Romanised name" TEXT, "Chinese name" TEXT, "age at appointment" FLOAT, "Portfolio" TEXT, "Prior occupation" TEXT)

How old was the official with Chinese name ?
SELECT "age at appointment" FROM table_25183 WHERE "Chinese name" = '孫明揚'
SELECT "age at appointment" FROM "table_25183" WHERE "Chinese name" = '孫明揚'