Facial aging is basically a 3 dimensional process that affects facial bones, facial fat compartments and overlying dermis of the skin along with skin surface. These are actually responsible for facial projection and shape. As the cheeks start loosing projection with time this leads to deepening of lower eyelid and cheek junction leading to aged look. So the goal is 3 dimensional rejuvenation and slowing down the aging process as well.
It is always better to consult a plastic surgeon who understand the 3 dimensional process of aging and who understands what is ideal for an individual. Anti-wrinkle injection is basically used to block the muscle action responsible for dynamic wrinkles, whereas fillers are used for plumping and softening the static wrinkles.