And what will give the new comer courage to trade in the first place when they don't have the knowledge? I think this is why some people compare trading to gambling. They assume you can trade blindly and still be favor by market even if you have no knowledge about trading just like some gamble without employing any form of strategy but simply rely on luck. Trading thou possess high risk but it can be profitable if you can be patient to learn the necessary knowledge and become more experienced. I don't want to use expert because it doesn't exist in trading, you can only gain experience as you progress but can not be totally perfect.
It's not about how long but good and fast you're at learning. You can be trading for a long time and still be losing on a steady because you don't have the necessary knowledge to execute accurate trade. Your longevity means nothing but you knowledge and skills means everything. Moreover, trading is not a business buddy, it's more of a skills.