Skin changes in appearance as a consequence of aging regardless of how well it has been cared for. Aging itself is probably programmed into the genetic information meaning it is unalterable, at least until genetic engineering becomes a practicality. Various proteins which provide elasticity to the skin deteriorate. Glands that lubricate the skin dry up. Water content decreases and so on. This can be accelerated by sun exposure, smoking, and other forms of trauma. The process moves faster in individuals of fair complexion due to their susceptibility to ultraviolet sun damage.
In the end, the rate of visual aging is the sum of normal biologic aging plus alterable factors (eg. sun exposure). True reversal of aging with various treatments is minimal, at best. However, with a combination of prophylactic care and intervention treatment, skin can reclaim some lost years and look more youthful.