What is the functional lifespan of fusion?

The functional lifespan of fusion energy technology is still largely theoretical, as commercial fusion reactors have not yet been realized. However, once operational, fusion reactors could potentially provide a near-infinite supply of energy, given the abundance of fuel sources like deuterium and tritium. The main challenges lie in achieving sustained reactions and managing equipment wear over time, but with advancements, fusion systems might operate effectively for decades. Ultimately, the longevity will depend on technological developments and materials science innovations.