Ageing or aging see spelling differences is the process of becoming older. The term refers especially to humans , many other animals, and fungi, whereas for example bacteria, perennial plants and some simple animals are potentially biologically immortal. In the broader sense, ageing can refer to single cells within an organism which have ceased dividing cellular senescence or to the population of a species population ageing. In humans, ageing represents the accumulation of changes in a human being over time [1] and can encompass physical , psychological , and social changes. Reaction time, for example, may slow with age, while knowledge of world events and wisdom may expand. Ageing is among the greatest known risk factors for most human diseases : of the roughly , people who die each day across the globe, about two-thirds die from age-related causes. The causes of ageing are uncertain; current theories are assigned to the damage concept, whereby the accumulation of damage such as DNA oxidation may cause biological systems to fail, or to the programmed ageing concept, whereby problems with the internal processes epigenomic maintenance such as DNA methylation [2] may cause ageing.

Sydney Coleman receives royalties from Byron Medical and is an unpaid consultant for Medicis; he has no financial interest in Q-Med. Sydney R. Facial aging reflects the dynamic, cumulative effects of time on the skin, soft tissues, and deep structural components of the face, and is a complex synergy of skin textural changes and loss of facial volume. Many of the facial manifestations of aging reflect the combined effects of gravity, progressive bone resorption, decreased tissue elasticity, and redistribution of subcutaneous fullness. A convenient method for assessing the morphological effects of aging is to divide the face into the upper third forehead and brows , middle third midface and nose , and lower third chin, jawline, and neck.

We regularly face primary challenges in deciding what to eat to maintain young and healthy skin, defining a healthy diet and the role of diet in aging. The topic that currently attracts maximum attention is ways to maintain healthy skin and delay skin aging. Skin is the primary barrier that protects the body from external aggressions. Skin aging is a complex biological process, categorized as chronological aging and photo-aging, and is affected by internal factors and external factors. With the rapid breakthrough of medicine in prolonging human life and the rapid deterioration of environmental conditions, it has become urgent to find safe and effective methods to treat skin aging.