Thousands of Connecticut adults and children – some as young as 10 – struggle with eating disorders with many suffering secretly because the life-threatening psychiatric condition has gone undiagnosed and untreated, experts in the field report. “We used to see eating disorders start at 13 or 14. Now we frequently see 10- and 11-year olds,” said Dr. Diane Mickley, founder and director of the Wilkins Center for Eating Disorders in Greenwich, which has treated females and males for three decades. Mickley is a founder and past president of the National Eating Disorders Association (NEDA). “We’re concerned that there are many boys and girls flying under the radar who could be struggling with eating disorders that aren’t diagnosed or treated,” said Craig Brown, a founder and chief executive officer for Center for Discovery, which since 2011 has opened two adolescent residential treatment centers in Fairfield County for youth ages 11 to 17.