Well, it depends on someone's knowledge and understanding about economics. Some people work for 5 years and within those 5 years they put a portion of their income for investing into assets that can grow good in value over the next 15 years, and those people mostly live frugal lifestyle during those 5 years. They can live rest of their life happily without any financial issues.

Let's take the example of first one who worked for 5 years and after that he/she is happy to live rest of his/her life happily without any financial issues. Let's suppose the person made $1000 per month and put $250 aside in order to invest those into an asset, and now suppose the asset was Bitcoin where he/she invested that $250 during 2009 to 2014. That person don't need to work anymore because he/she has invested in a very good asset that made him/her a millionaire or most probably a billionaire.

Now let's take the example of the second one who worked for those 5 years and spent his/her monthly income without putting anything for investing. That person will still have to work for rest of his/her life because he/she hasn't invested anything into an asset like Bitcoin.