Final answer:
After age 30, chronic diseases such as type 2 diabetes, cardiovascular or heart disease, and cancer become more significant risk factors for death in U.S adults, especially during middle adulthood and onwards.
Step-by-step explanation:
After age 30, chronic diseases such as type 2 diabetes, cardiovascular or heart disease, and cancer become more of a risk factor of death for adults in the United States.
Middle adulthood, which lasts from the mid-30s to the mid-60s, is a time when many individuals face an increased chance of being diagnosed with these conditions.
These diseases are frequently the leading causes of death during this stage of life, as individuals start showing physical signs of aging and experience declines in vision, strength, and reaction time.
In addition, susceptibility to diseases continues to increase due to a less effective immune system. During old age, the risk of developing serious illnesses like cancer and pneumonia further escalates.
Additionally, cognitive impairment and disorders such as Alzheimer's disease become more common as the number of brain cells decreases and the immune system's efficiency wanes.