Table: rugby_squads_2007_3
Columns: player
position
date_of_birth_age
caps
club_province

Question: When was Tomokazu Soma born who plays for the wild knights?
SQL: SELECT "date_of_birth_age" FROM rugby_squads_2007_3 WHERE "club_province" = 'wild knights' AND "player" = 'tomokazu soma'