In other professions, those who were usually older, more experienced, and more considerate would obtain greater achievements. Because of this, an ordinary person would make a misconception when they looked at scientists and thought that an older scientist would be more capable.
In fact, it was completely different. the most outstanding research of any great scientist, be it Einstein or Newton, was usually carried out when they were between the ages of 25 to 35. This was the point when the human body was the most energetic and the brain's cognitive ability was the most dynamic. After that, everything would gradually go downhill.
However, the research results of these great scientists would often take a long time of refinement before they could become internationally acclaimed, which gave off the impression that a famous scientist was also an 'old guy'.