Any person licensed by the board as a physician assistant who has retired or may retire from such practice in this state is not required to biennially renew the person's license as required by this part, if such person files with the board an affidavit on a form to be furnished by the board, which affidavit states the date on which the person retired from practice and any other facts, as the board considers necessary, that tend to verify such retirement. If such person thereafter reengages in practice in this state, such person shall apply for licensure by the board as provided by this part and shall not be liable for payment of licensure renewal fees that accrued during the period of retirement.