What is the age of the celebrity who had a 402 aggregate? 
CREATE TABLE "list_of_contestants" (
  "celebrity" text,
  "known_for" text,
  "age" real,
  "professional" text,
  "series" real,
  "place" text,
  "dances" real,
  "highest_score" real,
  "lowest_score" real,
  "aggregate" real,
  "average" text
);
SELECT MAX("age") FROM "list_of_contestants" WHERE "aggregate"=402;