CREATE TABLE musical (musical_id DECIMAL, name TEXT, year DECIMAL, award TEXT, category TEXT, nominee TEXT, result TEXT)
CREATE TABLE actor (actor_id DECIMAL, name TEXT, musical_id DECIMAL, character TEXT, duration TEXT, age DECIMAL)

What is the duration of the oldest actor?
SELECT duration FROM actor ORDER BY age DESC LIMIT 1
SELECT "duration" FROM "actor" ORDER BY "age" DESC NULLS LAST LIMIT 1