My understanding is that it does work, for the period that they work in the company, because few work actually needs intensive brain activity. But it's bad for

My understanding is that it does work, for the period that they work in the company, because few work actually needs intensive brain activity. But it's bad for the employee, and bad for the companies down in the line because the employees would already been drained. That's why there is an implicit or explicit 35-yrs old deadline in the industry.