I've finished reading "The Ultimate Study Method to Make the Brain Serious" now. Most of the cells in the brain are decreasing with age, but there is a part that creates new cells in an exceptional way, which is the part of the hippocampus as large as the little finger on the bottom of the brain. Although the cell are born newly, peoples feel that their memory becomes worse when they get older, because they cannot use mechanical memory for which they must use much energy, as like when they were young. However, the association memories that associate and memorize things is said that if you accumulate various knowledge and relate and remember it even getting older, you cannot lose to young people. Hippocampus can be grown by way of study and lifestyle. What kind of lifestyle is good is to always make hungry time between meals without eating dull. Be sure to eat breakfast, and recommend brown rice, five grain rice, and rye bread etc., they do not raise the blood glucose value suddenly . It is better to keep blood sugar level for a long time. . Because sleep removes brain waste, it is necessary to ensure sleeping time for 7 - 8 hours. And it is possible to cultivate the hippocampus directly by walking and jogging to a degree that breath slightly bounces at exercise and if you have a habit of doing it for about 30 minutes every day, you will make you not only smarter but also you can prevent and treat the dementia and the depression. The above is a way to raise hippocampus, but stress will destroy it at the contrary and cause it to atrophy. The way to protect the hippocampus from the stress is to have a dream. Having a dream and studying for it is the silver bullet for relieving stress. The content of the dream is for instance, to travel through Japan, to become able to play some song on guitar, to become able to understand foreign movies without subtitles, etc. Anything is fine and the hippocampus does not shrink if you strive toward that goal. A dream is not a youth's privilege. Let the old man have a dream, too.