The answer to 'lifespan of surge protection' is that a good quality surge protector can last 3-5 years on average. Surge protectors are designed to absorb and dissipate excess voltage spikes to protect your electronics, but over time the internal components will wear down and the surge protection capability will decrease.
It's recommended to replace your surge protector every 3-5 years, or sooner if you notice it's not working as effectively. Signs it may be time to replace include frequently tripped circuit breakers, burning or melting smells, or if your electronics are still getting damaged despite having the surge protector connected.