CREATE TABLE "2008_six_nations_championship_squads" (
  "player" text,
  "position" text,
  "date_of_birth_age" text,
  "caps" real,
  "club_province" text
);

Question: When was the player with 51 caps from a Club/province of clermont born?
SQL: SELECT "date_of_birth_age" FROM "2008_six_nations_championship_squads" WHERE "caps"=51 AND "club_province"='clermont';