The relationships between age and brain activity are well documented in neurological research. Although human brain plays a significant role in how we think, behave, and interact with the world, our cognitive functioning can start to deteriorate as early as 40, (61) the age of 40 is a critical turning point for cognition. To be specific, according to Dr. Colin McKenzie, professor of economics in Keio University, most people become less capable of processing and memorizing information when they reach the age of 40. In addition to age, research has also found that a number of factors can influence our brain activity. For example, an Australian research team based in the Melbourne Institute of 7 Applied Economic and Social Research discovered that full-time work and brain function were related. They suggested that, for people over the age of 40, the (62) amount of work time for their cognition is twenty-five hours a week, which can keep the brain (63) . While working excessively long hours can impair their mind and body, working less than that amount of time can be harmful to their cognitive agility too. The study by Professor Karl Ericsson at Florida State University also showed that expert performers spent around 21 to 35 hours of practice time a week. However, Professor Ericsson’s study was not limited to a particular age group, but focused on behaviors that can drive effective performances. Although the (64) that twenty-five hours is the best for people over 40 still needs further investigation, it provides important information for companies that are planning to raise work time.