Ceramides are lipids (aka fat molecules) that are found in high concentrations within cell membranes. Lipid’s have one of three functions -- they make up part of the structure of a cell’s membrane, storing energy or signaling actions in cells. Ceramide is a structural and signaling molecule. It is made up of a fatty acid called sphingosine and is located within the membrane of cells, in great concentrations.
Skin aging is influenced by several factors, including genetics, environmental exposure, hormonal changes, and metabolic processes. In humans, structual and functional changes attributable to aging and more visibly evident in the skin than in any other organ.
Intrinsic (internal factors) aging, or your natural aging process, begins appearing in your mid-20's: