Final answer:
The definition of an elderly person varies, but in the U.S. it is typically considered to be someone aged sixty-five or older. The World Health Organization suggests a lower cut-off for semi-peripheral nations, and AARP uses fifty as the eligible age of membership.
Step-by-step explanation:
The definition of an elderly person can vary depending on the source. In the U.S., individuals aged sixty-five years old are typically classified as elderly and become eligible for benefits like Social Security and Medicare. The World Health Organization suggests a cut-off between fifty and fifty-five years old for semi-peripheral nations. AARP, an organization for older people in the United States, uses fifty as the eligible age of membership.