Understanding aging changes bones muscles seniors is important for seniors and their caregivers. changes in posture and gait (walking pattern) are common with aging.
The skeleton provides support and structure to the body. They allow the skeleton to be flexible for movement. Joints are the areas where bones come together. Instead, they are cushioned by cartilage in the joint, synovial membranes around the joint, and fluid.
Muscles provide the force and strength to move the body. In a joint, bones do not directly contact each other. Changes in the muscles, joints, and bones affect the posture and walk, and lead to weakness and slowed movement.
AGING CHANGES
People lose bone mass or density as they age, especially women aftermenopause. Coordination is directed by the brain, but is affected by changes in the muscles and joints. Between each bone is a gel-like cushion (called a disk). The bones lose calcium and other minerals.
The spine is made up of bones called vertebrae. The spinal column becomes curved and compressed (packed together). With aging, the middle of the body (trunk) becomes shorter as the disks gradually lose fluid and become thinner.
Vertebrae also lose some of their mineral content, making each bone thinner. This makes the arms and legs look longer when compared with the shortened trunk.
The joints become stiffer and less flexible. Bone spurs caused by aging and overall use of the spine may also form on the vertebrae.
The foot arches become less pronounced, contributing to a slight loss of height.
Thelong bonesof the arms and legs are more brittle because of mineral loss, but they do not change length. The cartilage may begin to rub together and wear away. Fluid in the joints may decrease. This is common around the shoulder.
Hip and knee joints may begin to lose cartilage (degenerative changes). Minerals may deposit in and around some joints (calcification). Finger joint changes, most often bony swelling called osteophytes, are more common in women. The finger joints lose cartilage and the bones thicken slightly. This decrease is partly caused by a loss of muscle tissue (atrophy). These changes may be inherited.
Lean body mass decreases. Muscle changes often begin in the 20s in men and in the 40s in women.
Lipofuscin (an age-related pigment) and fat are deposited in muscle tissue. The speed and amount of muscle changes seem to be caused by genes. Muscle tissue is replaced more slowly. The muscle fibers shrink. This is most noticeable in the hands, which may look thin and bony.
Muscles are less toned and less able to contract because of changes in the muscle tissue and normalaging changes in the nervous system. Lost muscle tissue may be replaced with a tough fibrous tissue. Overall height decreases, mainly because the trunk and spine shorten.
Breakdown of the joints may lead to inflammation, pain, stiffness, and deformity. Muscles may become rigid with age and may lose tone, even with regular exercise.
EFFECT OF CHANGES
Bones become more brittle and may break more easily. These changes range from minor stiffness to severearthritis.
The posture may become more stooped (bent). Joint changes affect almost all older people. The neck may tilt, and the shoulders may narrow while the pelvis becomes wider.
Movement slows and may become limited. The knees and hips may become more flexed. Walking may become unsteady, and there is less arm swinging. The walking pattern (gait) becomes slower and shorter. Loss of muscle mass reduces strength.
COMMON PROBLEMS
Osteoporosisis a common problem, especially for older women. Older people get tired more easily and have less energy.
Strength and endurance change. Compressionfracturesof the vertebrae can cause pain and reduce mobility.
Muscle weakness contributes to fatigue, weakness, and reduced activity tolerance. Bones break more easily. This is most often caused by changes in the muscles and tendons, rather than changes in the nerves. Joint problems ranging from mild stiffness to debilitating arthritis (osteoarthritis) are very common.
The risk of injury increases becausegait changes, instability, andloss of balancemay lead to falls.
Some older people have reduced reflexes. Some changes, such as a positiveBabinski reflex, are not a normal part of aging.
Involuntary movements (muscle tremors and fine movements calledfasciculations) are more common in the older people. lower knee jerk or ankle jerk reflexes can occur. A moderate exercise program can help you keep strength, balance, and flexibility. Older people who are not active may have weakness or abnormal sensations (paresthesias).
People who are unable to move on their own, or who do not stretch their muscles with exercise, may get muscle contractures.
PREVENTION
Exercise is one of the best ways to slow or prevent problems with the muscles, joints, and bones. Women need to be particularly careful to get enough calcium and vitamin D as they age. Exercise helps the bones stay strong.
Talk to your health care provider before starting a new exercise program.
It is essential to eat a well-balanced diet with plenty of calcium. Women and men over age 70 should get 800 international units (IU) of vitamin D daily. Postmenopausal women and men over age 70 should take in 1,200 mg of calcium per day. Pathogenesis of osteoarthritis. If you have osteoporosis, talk to your provider about prescription treatments.
RELATED TOPICS
– Aging changes in body shape
– Aging changes in hormone production
– Aging changes in organs, tissues, and cells
– Aging changes in the nervous system
– Calcium in diet
– Osteoporosis
Alternative Names
Osteoporosis and aging; Muscle weakness associated with aging; Osteoarthritis
– Osteoarthritis
– Osteoarthritis
– Osteoporosis
– Flexibility exercise
– The structure of a joint
Di Cesare PE, Haudenschild DR, Abramson SB, Samuels J. Philadelphia, PA: Elsevier; 2021:chap 104.
Gregson CL. In:
Firestein GS, Budd RC, Gabriel SE, Koretzky GA, McInnes IB, O’Dell JR, eds.Firestein & Kelley’s Textbook of
Rheumatology.11th ed. In: Fillit HM, Rockwood K, Young J, eds.Brocklehurst’s
Textbook of Geriatric Medicine and Gerontology.8th ed. Bone and joint aging. National Institutes of Health, Office of Dietary Supplements website. Philadelphia, PA: Elsevier; 2017:chap 20.
US Department of Health & Human Services. Updated July 26, 2024. Vitamin D: fact sheet for health professionals.ods.od.nih.gov/factsheets/VitaminD-HealthProfessional. Common clinical sequelae of aging. Accessed January 7, 2025.
Walston JD. 27th ed. In: Goldman L, Cooney KA, eds.Goldman-Cecil Medicine. Osteoporosis. Philadelphia, PA: Elsevier; 2024:chap 24.
Weber TJ. 27th ed. In: Goldman L, Cooney KA, eds.Goldman-Cecil Medicine. Brodkey, MD, FCCM, Associate Professor, Section of Pulmonary and Critical Care Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI. Philadelphia, PA: Elsevier; 2024:chap 225.
Updated by: Frank D. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Also reviewed by David C. Editorial update 01/07/2025.
– Bone Diseases
– Joint Disorders
– Muscle Disorders
– Older Adult Health Editorial team.
About the Author: This article was researched and written by the SilverWell Hub editorial team. It was medically reviewed by Dr. Sarah Mitchell, MD, Geriatrics.
Sources: This article is adapted from MedlinePlus, a service of the National Library of Medicine. Additional review by the SilverWell Hub medical review board.
Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice. See our full Medical Disclaimer.
Published: July 08, 2026 | Next review: January 2027
