No, you husband is not allowed to take you into a bar where the required age is 21, simply because you are married. If it is a bar/restaurant where they serve food and alcohol, it should not be a problem to sit in the bar area. However, if the establishment requires anyone who enter to be 21 or over, the marriage would not trump the legal age for admittance.
Attorney
Experience in misdemeanor and felony cases. General legal.