 From the bone features of the holotype OMNH 10146 and NCSM 14345 , it is estimated that Acrocanthosaurus requires at least 12 years to fully grow . This number may be much higher because in the process of bones remodeling and the growth of the medullary cavity , some Harris lines were lost . If accounting for these lines , Acrocanthosaurus needs 18 – 24 years to be mature . 
