A three-year study of nearly 4,000 adults ranging from age 19 to 94 found that brain health can improve at any age, challenging the common belief that mental sharpness must decline as we get older. Participants spent just a few minutes a day on brain-training activities, and researchers found measurable gains across multiple aspects of brain health, including thinking clarity, emotional well-being, and sense of purpose.
“patent pending”
Includes “Pittsburgh Sleep Quality Index and the Oxford Happiness Questionnaire”
The article doesn’t go into the details but it doesn’t look good. Including how happy you feel into a final metric of how well you can process data doesn’t seem rigorous.
"This 80 year old is happy and doesn’t know his own name so we will rank him higher than this woman who is still practicing law and playing chess at grandmaster level but is depressed and not sleeping well. "