AGE : advanced glycation end products 

Advanced glycation end products (AGEs) are a group of compounds that are the products of nonenzymatic reactions between reducing sugars such as Glucose and fructose and proteins, lipids, or nucleic acids.

 reducing sugar 

A sugar that serves as a reducing agent due to its free aldehyde or ketone functional groups in its molecular structure. Examples are glucose, fructose

 Glucose & fructose

the effect of sugar in our skin aging process is controlled by simple act of covalently cross-linking two collagen fibers which leave both of them incapable of easy repair. Glucose and fructose links the amino acid present in the collagen and elastin that support the dermis and producing AGEs and cause skin aging.