Context: CREATE TABLE table_name_70 (caps INTEGER, club_province VARCHAR, date_of_birth__age_ VARCHAR)
Question: Which Caps is the lowest one that has a Club/province of ospreys, and a Date of Birth (Age) of 19 september 1985?
Answer: SELECT MIN(caps) FROM table_name_70 WHERE club_province = "ospreys" AND date_of_birth__age_ = "19 september 1985"