**1. Introduction**

It is common for an individual to aspire a young-looking healthy skin. Nowadays, skin care routines have become an integral part of people's lives belonging to different age groups. People have come to realize it as an essential investment for maintaining a flourishing skin free of aging cues and skin related ailments. But since aging does occur over time, the signs can be coped with by regular care and practicing a conscious approach towards acknowledging skin aging [1].

People grow old with advancing age. As a result of this, the skin also shows aging indications. This phenomenon, where skin aging occurs over time refers to chronological aging. However, these very people are also exposed to external factors that they encounter in the environment. Aging prompted due to these external factors is known as extrinsic aging. If the external factor is Ultraviolet radiation (UVR), then resulting aging process is called photoaging. Thin parched skin and fine wrinkles generally occur during chronological aging. In contrast, photoaged skin is characterized by thickened epidermis and coarse wrinkles [2]. These skins have uneven pigmentation and often show presence of lentigines and freckles [3]. Although underlying routes

for both the aging processes differ, but many overlaps can exist. The fundamental reason behind this is that while people experience certain stage of chronological aging, they also undergo photoaging due to exposure to some amount of UVR on daily basis [4].

The focus of this book chapter is to discuss the importance of studies related to aging especially photoaging, their various underlying mechanism, role of antioxidants in ameliorating the aging signs along with recent advances and challenges associated with skin aging.
