galvanized gutters can last anywhere from 10-20 years, but will eventually corrode and need to be replaced. Galvanized steel is a great material for gutters because it resists rust and corrosion. However, over time the zinc coating will wear off and the steel will rust. The rate of corrosion depends on the climate (salt air accelerates corrosion), the type of paint used (paint slows corrosion), and how well the gutters are maintained (cleaning and painting every few years will extend their life). Most galvanized gutters have a lifespan of 10-20 years before they need to be replaced.

It really depends on the climate and environment that they are in. In a dry, sunny climate, they could last up to 20 years. However, in a more humid or salt-air environment, they may only last 5-10 years.