As one ages, the soft tissue of the face starts to sag and also lose its thickness of the layer of fat under the skin.  With the lower eyelid and cheek, there can develop a separation between the cheek fat due to sagging, and prominence of the lower eyelid fat, leaving a groove between the eyelid and cheek.  A non-surgical way of addressing this is with an injectable filler that can fill in the gap between your lower lid and cheek.  This can work very well in experienced hands.  A more definitive way is with lower eyelid surgery and/or a mid-face lift.