You are a forensic entomologist. you receive 50 dead maggots collected from a corpse during autopsy, shortly after the body was discovered. the medical examiner did not keep any of the maggots alive, so you send some of them to a dna lab for identification. the dna lab identifies the maggots as chrysomya megacephala. the body was found in a room where the thermostat was set to 26c. the average length of the remaining maggots is 13 mm. how old are the maggots?