About 65 million Americans are part of Generation X, and they will be the next generation to retire. A recent TD Ameritrade survey finds only 33 percent of Gen X workers expect to be "very secure" in retirement. Almost half worry about running out of money.

About 65 million Americans are part of Generation X, and they will be the next generation to retire. A recent TD Ameritrade survey finds only 33 percent of Gen X workers expect to be "very secure" in retirement. Almost half worry about running out of money.

Generation X, or Americans born between the mid-60s and mid-80s, won't start hitting retirement age for another 12 years, but a new report says many believe they're not on track. Thirty-seven percent say they'd like to fully retire, but don't think they'll be able to afford it and 43 percent say they're behind in their savings.