Whether or not a person should take creatine, according to WebMD, is very individualized. The effectiveness of creatine may vary from person to person. The decision to take creatine should be based on the specific goals of the individual.
WebMD states that creatine has been shown to improve athletic performance in young, healthy individuals, but it appears to only work for short-duration, high-intensity training such as sprints. Creatine has not been shown to be particularly effective in adults over the age of 60, in already highly trained athletes or in improving performance in aerobic activities such as long-distance jogging or running.