Research has found that eyes become baggy with age because the fat in the eye socket expands.
The human body is made of trillions of cells that constantly replicate. This process helps us grow, but everytime our cells divide, the ends of DNA strands — called telomeres — become shorter. At some point, the telomere is very short and the cell dies. This process starts as soon as we are born, taking us through the natural pattern of aging.