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if age number is zero , so still i can apply express visa..?
as long as you score minimum of 67 points on all criteria you can apply. (it's not just age, check all the fields, education, language etc...) there's plenty to do before
 
if age number is zero , so still i can apply express visa..?

Yes - you can still apply. It will be more difficult for you to score enough points to be selected.