All of the following are true about Ewing's sarcoma, EXCEPT

(C) Common in 4th decade # Ewing sarcoma, a highly malignant primary bone tumor.> The tumor is derived from red bone marrow.> Most frequently, it is observed in children and adolescents aged 4-15 years and rarely develops in adults older than 30 years.> Ewing sarcoma is the second most common malignant bone tumor in young patients, and it is the most lethal bone tumor.> Typically, the periosteal reaction and new bone formation with an onionskin appearance may suggest the diagnosis of E wing sarcoma.> It is highly radiosensitive and it melts like ice but only to recur at a later date.