Any person who, at the time of the passage and approval of the Construction Industries Licensing Act, is engaged in any occupation, trade or activity related thereto, pursuant to a valid license authorizing such acts and operations issued under laws repealed by this act and rules and regulations pursuant thereto, is entitled to continue such act and operations, and the license shall continue in effect until the expiration date thereof, subject in all cases to suspension or revocation as provided by the Construction Industries Licensing Act.