How is morphological aspect of aging on osteoarticular, kidney and GI?

Osteoarticular system : almost inevitable beyond the age of 60; bone mass is reduced (osteoporosis); muscles atrophy and are partially replaced by fatty tissue; joint cartilages deteriorate and are no longer repaired by chondrocytes, tendons Ligaments stiffen under the effect of glycosylation. Kidney : Glomerular anf interstitial fibrosis. GI tract: Progressive atrophy of mucosa Decrease of the regeneration potential of epithelial cells Decreased activity of glandular cells.