WBAP Morning News: Why Are So Many Retirees Being Forced Back to Work?

Leslie Boyden and Eric Coon, co-authors of Retirement Conquered, joined the WBAP Morning News. 64% of those aged 55 to 64 who retired have re-entered the job force as they found they could not live the life they wanted. How serious is this?  Should a person delay their retirement?  Will more retirees have to re-enter the job force?