lifespan

Lifespan refers to the total length of time an individual organism, such as a human, typically lives under normal circumstances. It varies due to genetic factors, health, environment, and lifestyle. For humans, the average lifespan has increased with medical and technological advances, generally ranging from about 70 to 85 years worldwide. Some factors, like genetics and healthcare, influence the maximum potential lifespan—the longest an individual might live—while actual lifespan can be shorter, affected by accidents, diseases, or other risks. Overall, lifespan measures the duration from birth to natural death under ordinary conditions.