Swollen ankles in the elderly are known as lower extremity edema that often affects older adults. Foot edema is evident when the shoes become too tight or markings on the ankles from the socks. Swollen ankles are annoying and at risk of reduced mobility and skin breakdown, but what is happening inside the body? Although leg swelling is common, especially if you have been walking or standing for long, foot edema treatment is administered, if there is no known cause.