Senescence is the process of aging, where the body becomes less strong. Genetics play a partial role in the way individuals age in adulthood. Physical signs of aging become apparent. Skin starts to change and "loosen" after the age of 30 as collagen starts to decrease. Wrinkles become more predominant; skin is less firm, age spots and blood vessels are more apparent, and the texture of the skin starts to change. Veins are more noticeable, and nails become thicker. Hair begins to grey and becomes thinner, and some may experience baldness. Muscles start to weaken, joints are less flexible, bones are less dense, and body shapes change to include more fat. Inner organs show signs of aging, and cells slow down with age. Lungs and senses are less efficient. Late adulthood: Muscle pain, breathing difficulties, frequent urination can become more present, and sleep apnea can occur. Late adults require less sleep. Adults in this stage require more exercise as their best defense again ailments.
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Increased chances of diseases and disabilities. Late Adulthood: Primary aging refers to the physical changes that occur as we age. Osteoporosis occurs due to low bone mass and deterioration of bone tissue. Compression of morbidity refers to the shortening of the time a person spends ill before death.