The skin tends to lose its elasticity with age. In the eyelids this results in excess skin which forms folds in the upper lids and deepening creases in the lower lids. There may also be a loosening of the muscles in the lower eyelid that allows fat from the eye socket to push forwards and produce bags. In some people there is an inherited tendency for eye bags to develop in early adult life before any skin changes. Rarely problems can develop in and around the eyes as a result of medical complaints (eg thyroid disease).