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This is the most realistic statement and I like it. If we talk about early retirement then one of the ways that everyone can do this is by investing. You can invest in gold, silver, crypto or property. By owning investments you have the opportunity to retire early. You can't retire early if you only rely on your salary. But the problem is that not everyone has enough salary for them to invest. Especially if you are married and have children.
So in my opinion, if you are not rich and don't have a business, the only way I think is that you have to work harder to have additional income so that your salary can be invested. This is very difficult but not impossible. I think the ideal retirement time for the average person is around 40 or 50 years. I don't know whether that can be called early retirement or not.