Longitudinal studies of adult changes in various intellectual tasks show that declines in ability typically begin at different ages for different tasks. Which of the following is true regarding such changes?

While verbal comprehension does continue to develop and may remain stable into the sixties, studies often suggest that it does not necessarily peak at this age. Instead, it may maintain a level of stability or even improve slightly due to accumulated knowledge, rather than peak as stated.

Inductive reasoning, which relies on the ability to make generalizations from specific observations, generally shows declines later than the forties. While some decline may begin in middle age, serious declines are often observed in the fifties or sixties rather than in the forties.

The ability to perform simple arithmetic functions often remains stable well into later adulthood. Many studies suggest that substantial declines in basic arithmetic skills do not typically occur until much later in life, often beyond the forties.

Verbal memory can indeed remain robust into older age, but evidence suggests that declines can begin earlier than the eighties. Some studies indicate that changes in verbal memory capacity may start gradually in the sixties.