The biggest issue as far as I can tell is that it's easy to 'lose' at any stage. You can make a ton of decisions starting from about age 15-20 that influence your degrees of freedom at age 40 (in the article there's a family of 3 that seemingly have little savings, for example).
If you were born to a non wealthy household, the reality is that you simply don't get to go through life not focusing on money. Your income, investments, and career have to be at the forefront of your mind, always. And even then there's a ton of chance involved.