user: Question: What is the date of birth for the player from Ulster and plays at Centre position?
Columns: ['Player', 'Position', 'Date of Birth (Age)', 'Caps', 'Club/province']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Ross Ford', 'Hooker', '23 April 1984', 16.0, 'Glasgow']
SQL:

assistant: SELECT "Date of Birth (Age)" FROM "Table" WHERE "Club/province" = 'Ulster' AND "Position" = 'Centre';