I'm 62 and have had saline breast implants for 25 years. What can I expect in the future since I've read they last 10-25 years?

Thank you for the question. It is difficult to give you definitive advice based on the information provided; nothing will replace in-person evaluation when it comes to doing so. Some thoughts may be helpful to you however.
Generally speaking, breast implants do not need to be exchanged every 10 years;  if the implants are in "good shape" and patients are pleased, there is no "standard exchange time".   In other words, I would not suggest that you undergo revisionary breast surgery solely based on the fact that the breast implants are "25 years old".
  Having said above, I think that you will benefit from in person consultation with board-certified plastic surgeons in your area. The consultation process will allow you to  obtain more specific information,  including the pros/cons of additional surgery now versus at a more senior age.
Best wishes.
 

It’s great news that you haven’t had any problems with your breast implants for over 25 years.  Breast implants are not lifetime devices and they will “wear out” eventually. When this happens with saline implants, one or both will deflate, the saline is absorbed by your body and you are left with a deflated breast or “flat tire”. There generally isn’t a health risk to this happening but will require another surgery to either remove or replace your implants. Many women like you choose to be proactive and exchange or remove their implants when they are still at their healthiest and before the deflation happens. I would advise starting the conversation now with a board certified plastic surgeon with many years of experience with this surgery to find out your options and the pros and cons of when to have your surgery. Having information that is personalized for you, will help you make the best decision.