While it's no secret that sustained levels of stress are not good for your health, there is more to the stress story than "stress is bad." As it turns out, how you perceive stress is just as important as the amount of stress you're experiencing.
The aging brain goes through predictable changes, and as a result, old age is usually accompanied by some cognitive decline, even dementia. Happily, some of the risk factors for mental aging are open to intervention.
This research replicates previous work showing that older adults remember less and are more distractible than younger adults. However, this work also suggests that there is a silver lining to this combination.
Humans are complex animals. Our intelligence is a complex adaptation. And the diverse and surprising ways in which we use it today suggest that we owe it to more than a handful of simplistic evolutionary scenarios.