CREATE TABLE table_name_4 (date_of_birth__age_ VARCHAR, caps VARCHAR, club_province VARCHAR)

When was the player with 51 caps from a Club/province of clermont born?
SELECT date_of_birth__age_ FROM table_name_4 WHERE caps = 51 AND club_province = "clermont"
SELECT "date_of_birth__age_" FROM "table_name_4" WHERE "caps" = 51 AND "clermont" = "club_province"