Marry well.
What I mean is this:
Your spouse should have a career or should think of having a career of his/her own. Its not about having a lot of money, its to eventually have someone as a financial backup in case things go wrong. Works for both partners.
I love my wife but financially I am in trouble. I make enough money but she has no career aspirations. Her family is quite poor and I had to get mortgage for a house for her parents. In future I will also need to worry about their health expenses.
This effectively means I can never get out of the rat race.