cross section of skin layer with damaged collagen, elastin fibers and fibroblasts in the dermis .

skin aging wrinkles collagen elastin fibers fibroblasts cross damaged broken reduce lose age protein amino acid hyaluronic structure cell strength flexible elasticity decline depletion lines firm skincare produce tissue crow feet formation synthesis stretched shape production layer epidermis dermis hypodermis muscles biology vector diagram infographic flat design schematic blood vessels aesthetic dermatology beauty white background wrinkled flexibility firmness font cartoon line organ sketch vector