A fibroblast is a cell in connective tissue that produces collagen and other fibres.
Fibroblasts are interspersed among the collagen fibers of the dermis, and synthesize collagen and the ground substance of the dermis (glycosaminoglycans).
The fibroblasts are more numerous and larger in the papillary dermis than in the reticular dermis.
Why do skin fibroblasts slow down their collagen production as we get older, even though they can still produce it?
Fibroblasts in aged tissue start acting old themselves.
When fibroblasts are isolated from aged tissue in the lab and exposed to the same stimulating factors the body uses to kick them into gear, skin fibroblasts once again start producing significant quantities of collagen.