Every child should be tested for high cholesterol as early as age 9, surprising new advice from a government panel that suggests screening children in grade school for a problem more common in middle age. The panel urges cholesterol screening between ages 9 and 11 — before puberty, when cholesterol temporarily dips — and again between ages 17 and 21. The panel also suggests diabetes screening every two years starting as early as age 9 for children who are overweight and have other risks for Type 2 diabetes.