India, Aug. 5 -- Nearly half of older American workers expect Social Security to be their main source of income after they retire, according to a new report. This is worrying retirement experts because Social Security was never designed to be the only source of retirement income.

The federal Social Security Administration says Social Security should not be treated as a person's only retirement income. On average, Social Security replaces only about 40% of the income a person earned while working, according to the Social Security Administration. This means many Americans may need other sources of money to maintain their lifestyle after leaving the workforce.

Retirement experts generally recommend having multiple sources of income during ...