aging skin. collagen elastin and oxytalan fibers. hyaluronic acid

aging skin fibroblast collagen elastin oxytalan older younger hyaluronic acid comparison difference closeup fiber visual representation lifetime dermatology structure young old age diagram human epidermis dermis wrinkle medicine layer anatomy beauty medical healthy health disease care body vector skincare deep fibre beautiful buttocks capillary crease crinkle cross fat female fibers gland hair hormone hyaluronan hypodermis layers nerve problem protein pucker ruck ruga rugosity science subcutaneous tissue vessel water woman wrinkled wrinkles