There are many interpretations on the pros and cons of intelligence. A con I often notice is awareness. I believe that ultimately, everyone's mental path is linear. We all go through the same major stages in life and sometimes people reach the end of their physical age before reaching the next stage. Quite often, people stay stationary in mental development and remain on the same stage for too long. Eventually they lose all momentum and remain there forever.

Each person's mental and physical growth is linked but do not necessarily grow at the same rate. Some people have bodies that age much faster than their mind does. Others have bodies that remain young as their mind grows old. Some people mask their age but when you look closely you begin to see the signs of decay.