Final answer:
The physiological change that does not typically occur with aging is decreased fat mass. Instead, aging usually leads to increases or changes in body fat distribution.
Step-by-step explanation:
The question examines which physiological change does not typically occur with aging. Aging is associated with a variety of physical changes, but not all processes experience a decline. Notably, age-related physiological changes include decreased bone density, exemplified by conditions like osteoporosis; decreased immune function, leading to a diminished capacity to fight diseases like the flu; and decreased lean body mass, as muscle tissues atrophy.
However, decreased fat mass is not a typical change with aging; actually, fat mass tends to increase or redistribute with age.