What is the birthday of the player who has Years at Club of 1951?
CREATE TABLE "players_who_made_their_debut_for_the_gee" (
  "debut_year" real,
  "player" text,
  "date_of_birth" text,
  "games" real,
  "goals" real,
  "years_at_club" text
);
SELECT "date_of_birth" FROM "players_who_made_their_debut_for_the_gee" WHERE "years_at_club"='1951';