CREATE TABLE table_203_18 (id DECIMAL, "year" DECIMAL, "film" TEXT, "role" TEXT, "co-star" TEXT, "director" TEXT, "notes" TEXT)

how long has she been making films ?
SELECT (SELECT MAX("year") FROM table_203_18) - (SELECT MIN("year") FROM table_203_18)
SELECT (SELECT MAX("year") FROM "table_203_18") - (SELECT MIN("year") FROM "table_203_18")