<s>[INST] <<SYS>> This is a medical question of type : susceptibility <</SYS>> Who is at risk for What I need to know about Crohn's Disease? ? [/INST] Both men and women can get Crohn's disease, and it can run in families. People with Crohns disease may have a blood relative with the disease or another type of IBD. Crohns disease most commonly starts between the ages of 13 and 30. </s>