A strength of longitudinal research is that, over time, it provides information about age-related changes over time.
In longitudinal research, the same participants are reassessed over time to check for any potential changes. Researchers observe and gather data on several aspects in longitudinal studies, a type of correlational study, without aiming to alter any of them.
Although epidemiology, economics, and medicine employ longitudinal research as the most common, the other social and medical disciplines may also use it. Any length of time can be used for longitudinal research as long as participants are checked on often. They may last for a few weeks or for many years. They typically last at least a year and usually longer.
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