Very few 18-29 year-old Americans are "millionaires," and among those, a lot of that wealth isn't exactly spending money.

If you have enough time and you can be diligent, it's quite possible to become a millionaire. Low-fee index funds can help you get there. Be sure to use IRAs and/or 401(k)s if you can, as well, for ...

So you'd like to be a millionaire. Who wouldn't? It would be especially good to be a millionaire by the time you retire -- if not a multimillionaire. For many people, this is far more achievable than ...