You all missed the real reason. Holding the hands behind the back allows walking and standing with a slight hunch forward. This relieves the nerve compression of sciatica, a common ailment of older people, especially men. It is possible that many who do this don't even fully recognize why they do it, but just that it makes them feel better.
FLASH Application. Online Application for an Insurance License. The California Department of Insurance (CDI) requires California resident applicants to first pass the qualifying license examination prior to submitting their license application.
Synonym(s): hot flash. n. A sudden brief sensation of heat, often over the entire body, caused by a transient dilation of the blood vessels of the skin, experienced by many women in the period around menopause and by both women and men undergoing certain medical treatments, especially hormone treatments for breast or prostate cancer.