Lifespan/ˈlaɪfspæn/ Definition 1 of 3Pro Tip 1/3Context Matters Lifespan varies for different species; context shows whose lifespan is referenced. A mayfly has a lifespan of just 24 hours. Pro Tip 2/3Not Precise 'Lifespan' references an average or typical duration, not a guaranteed time frame. Cats have a lifespan of 12-15 years, though some live longer. Pro Tip 3/3Variable Factors Lifespan can be influenced by lifestyle, healthcare, and environment. Regular exercise can extend a person's lifespan.