Every people in this world would like to have young look for a long period. Our perception of attractiveness is highly correlated to age and health. From an evolutionary point of view, health is the dominant driver because it indicates that a person has good genes. In terms of age, there is a continuous drop in fertility, particularly in women. In the past 20 to 30 years most of the research into attractiveness has centered on how the shape of the face - facial average ness, symmetry and male-female dimorphism - affects our perception of beauty. There was no scientific focus on skin. There is a lot more to ageing skin than wrinkles. Melanin and haemoglobin produce the brown and red coloration in human skin. Sun damage causes uneven skin colour and this, along with shadows due to lines and wrinkles, is the key to our perception of age. Some products, like niacin amide, can reduce the amount of melanin expressed in age spots. By reducing contrast with background skin, this produces a corresponding perception of a reduction in age.