how old was gideon brand van zyl when he took office as governor ?
CREATE TABLE table_203_89 (
    id number,
    "#" number,
    "name\n(birth-death)" text,
    "took office" text,
    "left office" text,
    "monarch" text,
    "prime minister" text
)
SELECT "took office" - "name\n(birth-death)" FROM table_203_89 WHERE "name\n(birth-death)" = 'gideon brand van zyl'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: how old was gideon brand van zyl when he took office as governor ? ### Input: CREATE TABLE table_203_89 (
    id number,
    "#" number,
    "name\n(birth-death)" text,
    "took office" text,
    "left office" text,
    "monarch" text,
    "prime minister" text
) ### Response: SELECT "took office" - "name\n(birth-death)" FROM table_203_89 WHERE "name\n(birth-death)" = 'gideon brand van zyl'