Final answer:
A sense of personal control peaks in adolescence and declines in adulthood.
Step-by-step explanation:
According to Lachmann, researchers have found that on average a sense of personal control peaks in adolescence and then declines. This is supported by the stages of adulthood, which show that physical, cognitive, and social changes typically occur during these times. In early adulthood, physical abilities are at their peak, including muscle strength, reaction time, sensory abilities, and cardiac functioning. However, as individuals progress through adulthood, these abilities may decline.