As seen on plasticsurgery.org:
The reality is that breast implants are not considered to be “lifetime devices,” but they are designed to be long lasting and safe. Patients can expect today’s implants—the products of decades of research into stronger shells and more stable fillers—to last more than a decade, with the chance of rupture increasing about one percent each year. That means after a decade, there is a 90 percent chance that the implant will still be fully intact.