Last updated January 25 2008: 11:05 AM ET
Set lofty goals The old "save 10% of your income" rule isn't enough for extreme early retirement. Aim instead to sock away 20% to 25% of what you make, says Brock. If you earn $100,000 a year, that means saving as much as $2,000 a month. Start at age 25 and by age 45 you'll have $1.2 million, assuming an 8% annual rate of return. Last updated January 25 2008: 11:05 AM ET
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