The lifespan of tun shells varies depending on the species and environmental factors. In general, tun shells have a relatively long lifespan compared to other marine invertebrates, with some individuals living for up to 20 years or more in the wild. Notably, various factors, including temperature, food availability, predation, and disease, influence the lifespan of tun shells. For example, they often have shorter lifespans in warmer waters with higher metabolic rates.