What date did the 90-94 year old have a tie of 1:25.91 at the LC pool?
CREATE TABLE "master_world_records" (
  "pool" text,
  "age_group" text,
  "time" text,
  "event" text,
  "date" text
);
SELECT "date" FROM "master_world_records" WHERE "age_group"='90-94' AND "pool"='lc' AND "time"='1:25.91';