It depends on the material they're made of, how well they're maintained, and the climate you live in. If they're made of vinyl, for example, they may only last 5 years. If they're made of copper, they may last up to 50 years. Metal is generally shorter-lived than plastic or rubber and can corrode relatively quickly in a harsh climate. Consult with a professional to get an accurate estimate for your specific situation.

There is no definitive answer to this question as it depends on a number of factors, including the material from which your gutters are made, how well they are installed, and the climate in which you live. In general, however, most experts recommend replacing your gutters every 5-7 years.