Social Security is the foundation stone of that kind of retirement security. It not only needs to be strengthened in order to make sure it's there for younger baby boomers and Generations X and Y, but it probably needs to be strengthened and expanded because the retirement benefits now being offered by most employers are not sufficient to support middle-income Americans in their long years of retirement.

The children of baby boomers should take very seriously the consequences for them of the inadequate funding for them of the baby boomer generation. This is a huge economic problem for the nation, not just for individuals or individual families. Think about it for a minute - if retirees become 20% of our population and their purchasing power falls below what has been normal for retirees in the past, one important engine driving our economy will be diminished.

It's usually much easier for people with professional skills to find work for themselves or even possibly to continue with their old employer, but on a part-time basis. Some labor economists predict that in about five years there will be a labor shortage in the United States and that demand for retirees to work part-time will grow naturally. I don't know if that's true or just wishful predicting.

One of the strongest lessons I learned in doing six months of work on retirement topic was how absolutely crucial the Social Security system is for the great mass of Americans. The research of professionals and our own reporting convinced me that many millions of people are not capable of effectively managing the finances for their own retirement.

I personally make sure that some of my investments are in foreign securities or in international commodity portfolios that are independent of the US dollar. But that's a personal preference. I do not invest in currencies because it's so complicated and so risky. I would not attempt that without excellent professional help.

The main problems are insufficient diversification and the failure to pick age-appropriate strategies - that is, more aggressive when you're younger, and more conservative when you approach retirement. But even then you have to invest for growth.

The most common mistakes were investing in money market funds by people who were so scared at the prospect of managing their own funds that they picked the most conservative option, and their investments did not keep up with inflation. The second major mistake was being too heavily invested in their own company's stock, and buying when it was high and there was a lot of optimism about the company, and then having to sell it low when the company got in trouble.