I'm not really agree with this. The stressful days of a traders is when they are starting. They have to overcome their loses because that is normal in trading and if you don't have a nice mindset and let your emotions control you probably it will result a severe stress on you. The beginning of your journey in trading is the stage where you have to survive those uncomfortable things that happened to you. If you can survive in a year of trading with a profit, then probably the stress is starting to disappear. So if you become an old trader then probably a profitable traders which means it's easier for you to make money because you already have an edge.