Cholesterol is found in each and every cell of our body. Cholesterol is a water repelling compound and so it does not get dissolved in the bloodstream. It is a waxy steroid metabolite. It is required for the proper functioning of the body. It is required for the production of vitamin D, hormones and bile juices. Low-Density Lipoprotein (LDL) or bad cholesterol and High-Density Lipoprotein (HDL) or good cholesterol are the two types of cholesterol. Simple blood test helps measure cholesterol levels in the body. The ideal LDL:HDL ratio and the ideal cholesterol levels are same for all ages. As you are looking for cholesterol range by age, here is the required information regarding normal cholesterol range.