Most Americans retire after the age of sixty. The usual age of retirement is 65, although some people retire at 55 or younger. Other Americans do not retire until they are in their seventies. This type of "late retirement" is more frequent now as population growth in the US slows down, and the average age of the citizens increases. Americans usually make plans for retirement well in advance. Their income after retirement may include interest on bank savings and a company pension(退休金). Americans also receive Social Security payments from the federal government.