LDL cholesterol, also known as "bad" cholesterol, should be below 100 mg/dL. However, doctors may not express concern about levels of 100-129 mg/dL for people with no health issues, but they may suggest treatment at this stage for people with heart disease or its risk factors. Its important to note that normal cholesterol levels vary based on age, sex assigned at birth, and other factors. For example, the acceptable range for LDL cholesterol in children and adolescents aged 19 and below is below 100 mg/dL. Its best to talk to a healthcare provider about what your cholesterol test results mean for you and what your target LDL cholesterol level should be based on your individual health status and risk factors.