So far, only two types of mental exertion have been shown to improve or preserve overall cognitive ability. One is musical training. Experts state that listening to and making music is not only an auditory experience; it is a multisensory and motor experience. Playing an instrument changes how the brain interprets and integrates a wide range of sensory information, and making music over a long period of time can change brain function and brain structure. The other is to learn a new language. As for the role of language-learning in brain power, a study carried out among students revealed that attention gets better when a new language is studied intensively even if it is for a short time and it gets even better when more practice is done for longer. The results of the study confirm the cognitive benefits of language-learning and give important and warming messages: firstly, even a short, intensive course can show beneficial effects on some cognitive functions. Secondly, this effect can be maintained through practice. So, we can say that it is never too late to start a mental activity such as learning a new language.