Not based in reality for most Americans. One example shows someone age 25 earning $45K per year and increasing by age 40 to earning $142K per year based on 3% annual raises. This author apparently is not aware of the reality of low starting wages, stagnating and decreasing wages, nor higher mandatory standard of living costs that limit the amount of money you have freed up for retirement saving. He says these are just excuses based on fear, not the reality of not having enough money to pay for a home and raise children. I have never gotten a 3% raise per year. I am lucky to get a 1% raise if that. I'm already as frugal as can be. And he expects me to find 15% of that stagnant income to fund retirement. Ha. He needs to base his information on reality. His book is geared more for a teenager just learning about how to invest for retirement, as opposed to an adult who really is in the thick of trying to figure it out.