| cerebral spinal fluid amount increases | — | brain | Human | |
| Dental wear and tear | — | tooth | Human | |
| deficits in homeostatic equilibrium controlled by endocrine system | — | endocrine system | Human | |
| decline in respiratory muscle fibers | — | respiratory system, muscle | Human | |
| muscle atrophy (sarcopenia) | — | skeletal muscle | Human | |
| thymus involution | — | thymus | Human | |
| Dendrite regression, reduction in dendrite length | — | brain | Human | |
| Changes to elastin fibers in lower dermis | — | dermis | Human | |
| maximum workload in response to exercise stress decreases | — | heart | Human | |
| interstitial fibrosis in medulla | — | kidney | Human | |
| circadian GH change | — | plasma | Human | |
| Menopause and female fertility loss | — | female reproductive system, endocrine system | Human | |
| volume of perivascular space around thymus increases | — | thymus | Human | |
| triglyceride levels increase | — | plasma | Human | |
| renewal capacity declines | — | hematopoietic stem cells | Human | |
| Leukoaraiosis | — | white matter | Human | |
| Hair greying | — | hair | Human | |
| functional decline and decreases in macrophage numbers in bone marrow | — | macrophage | Human | |
| motor function impairment evident in altered gait and balance | — | nervous system | Human | |
| intima undergoes diffuse thickening | — | arterial intima | Human | |
| Facets of heart physiology altered during exercise | — | heart | Human | |
| bone mineral density in cortical ulna decreases | — | ulna | Human | |
| increased sustained activity in tests of working memory | — | brain | Human | |
| Cholesterol level - Borderline (Male) | SeriesIncidence | plasma | Human | |
| circadian prolactin flattened | — | plasma | Human | |