What are the symptoms of male aging?

　　male Although the aging of body functions is not like female menopause There is an obvious physiological change process, but some aging changes that are almost irreversible will occur from middle age.

　　1. Brain function:

　　Ability to concentrate and language skills change little with age. The ability to store and retrieve information decreases slightly but steadily from the age of 20.

　　2. Cardiac response ability:

　　After the age of 20, the acceleration stress of the heart begins to decrease. Max per minute heart rate On average, it decreases 10 times every 10 years.

　　3. Aerobic endurance:

　　Due to the decrease in the body's oxygen supply capacity and reduced working ability, the working ability at the age of 70 is only half of that at the age of 20.

　　4. Body fat:

　　At the age of 75, the proportion of body fat doubles that at the age of 25, with most of the increase in muscles and heart organs.

　　5. Penis erection angle:

　　Under normal circumstances, the erection angle of the penis reaches its maximum value at the age of 30, and then gradually decreases as the age increases. The maximum decrease is at 50