No one knows how long breast implants will last, but it probably averages around every 10 years or so. If a woman has a saline implant in, then the implant will just go flat, and it's not a big deal. If a woman has silicone, it might be a little bit more difficult to monitor. I see my silicone patients back every year, just to check in and see how they are doing, and see how the implant feels, if it's soft. Currently, the FDA recommends that a woman get a breast MRI every two to three years looking for a silent leak. My guess is that this will change with time, and we may have other modalities to assess for breast implant leakage, but that's how we assess right now.
How To Tell if Your Silicone Breast Implants Are Leaking
Dr. Elisa Burgess notes that saline implants will noticeably deflate over a period of 10 years and silicone implants, while not as noticeable, will also decrease in mass over a period of about a decade.