The study is designed to gather data from two different age groups of men and women to evaluate the differences in skin oxygen properties, if any, between chronically sun exposed and less sun exposed skin. This study makes use of an oxygen sensing bandage device that can quantitatively measure both tissue oxygen partial pressure and oxygen consumption rate. Due to its early stage in development, the device has not yet been designed to control for high melanin content of skin. Thus only subjects with lower melanin content (i.e. Fitzpatrick skin types I - IV) will be included in the study. In addition, tattoo markings, scarring or significant natural discolorations can interfere with the imaging results by absorbing blue light and subjects with any of these will be excluded.