This podcast episode addresses a listener's question about the word "lifespan," exploring its usage in various contexts. The hosts discuss the applicability of "lifespan" to living things, objects, and ideas, concluding that while it's commonly used for living beings and objects, its use for ideas is less natural. They offer alternative words like "duration" and "life cycle" and provide examples of "lifespan" in sentences. The discussion also touches upon life expectancy across different countries, with Hong Kong cited as having the highest, and explores lifestyle choices that may influence lifespan. Finally, a role-play scenario demonstrates the use of related vocabulary in a practical context.