i believe the youngest is about... 4 weeks? my middle dragon is about 3 months and the oldest is probably 7-8 months, hard to tell on her since she was imported. female is 130 grams though. 6 inches snout to vent. she dropped wieght to 115 since i have had her back from a friend (3 weeks) but still looks plump and she is staying hydrated. she's really hard to care for.