Consider the findings from the large UK study I recently blogged (Akarlin blogs it too): Some of these have steep declines. It's not just an artifact of the FLynn effect, age really has a strong negative effect on cognitive abilities. Consider the rates of dementia and age:
Ending cognitive aging
Ending cognitive aging
Ending cognitive aging
Consider the findings from the large UK study I recently blogged (Akarlin blogs it too): Some of these have steep declines. It's not just an artifact of the FLynn effect, age really has a strong negative effect on cognitive abilities. Consider the rates of dementia and age: