This combination of cognitive, emotional, and personality traits helps explain why the greatest professional or leadership successes often come late in life.
To reach this conclusion, Gilles Gignac’s team compiled data from numerous studies on sixteen psychological dimensions: memory, reasoning, emotional stability, empathy, mental flexibility, resistance to cognitive biases, among others. These results were standardized to establish a map of mental evolution throughout life.
“One day in February 2021, I realized that something was not right in my head”
The picture is nuanced: working memory and processing speed actually decline after the thirties. But other abilities, such as general knowledge, moral understanding or the ability to manage emotions, continue to progress. “Between 55 and 60 years old, we observe a sort of sweet spot of operation psychological humandescribes Gilles Gignac. People then have a rich knowledge base, great emotional stability and greater resistance to errors of judgment.”
This balance point explains why many people this age excel in complex and demanding roles, where reasoning, experience and social intuition must be combined.
The decline, after 70 years, accelerates
The study also reveals that this period of cognitive power is not eternal. “We were struck by the steep decline after 70 yearsnote Gilles Gignac. In our most classic model, a 20-year-old young adult already scores higher than many leaders over 70.”
“Neuroscience proves that freedom is an illusion; we are just puppets in the hands of our brains”
The researcher, however, highlights strong individual differences: some maintain high performance well beyond this age, especially when their health and curiosity remain maintained.
Rethinking the value of age
These results invite us to review the way society perceives middle age. “People in their 50s are often at a disadvantage in the job marketregrets the researcher. However, our data show that this period corresponds to higher functioning. This suggests that companies may be missing out on a tremendous reservoir of skills and judgment.”
According to him, this research calls for a reassessment of the role of adults in the middle of life, particularly in management positions. “Our psychological capacities are not fixed at 25 years oldhe insists. They evolve. In many cases, individuals are at their highest skill level at age 55. It is both a message of hope and a call to rethink how we value experience.”
“Changes in the brain happen first, even before weight gain”: when junk food confuses our neurons
