Trading isn't a lifetime job to some people but there are people that have made it a permanent job. On point number 2, trading doesn't have to be enjoyable, you know the reason why you are trading you are not after what is enjoyable to you. Making Money is hard and a lot of times we might have to do things that are not enjoyable to become financially stable. Good things takes time to happen so don't expect the journey of trading to be easy. If it gets too stressful you can take a break
Trading is hard and risky but it doesn't have an age limit for retiring from it, it depends on the ability of every trader. Trading takes a lot from people both physically and mentally, it can be quite exhausting to be in a volatile business where you don't know for sure if you're going to be profitable or not. It's not like other businesses where you'll put your money and your sure of making profit returns, you can lose your trade after all your careful analysis. Trading should be an alternative source of income, it's not where somebody should put all their hope to make profit.