Calculated Attribute with if Condition

Hi All

  I am trying to create a calculated attribute age group for an age attribute for example if the age is between 30 -35 the age group column shoul have 30-35 as the age group corresponding to the record.I tried to create using IF condition but I am facing invalid expression error I am trying to put the condition as below

if("AGE" >=50 AND  <=55,'50-55') but it is not working .Request for help in creating the calculated attribute.

Regards

Santosh