Is this "double bubble"? Mild pain most days in this 450 cc implant. Memes textured from about 28 years ago. (photo)

I assume from your question that you had the 325 cc implants replaced with 450's, and now have the indentation on the bottom of the breast. Possible causes are:Lowering of the fold to accommodate the larger implants. This may be best corrected with a lift.Release of the pectoral muscle. This is an overlooked cause of double bubble, because the muscle adheres to the capsule. It typically animates or pulls up when you flex. Consider converting to the split muscle plane to correct that.Scar tissue. This may be correctable with a release.

It's difficult to tell from the provided photo, but you may have a double bubble. You can elect to have the implants removed at any time. Because you have had them for 28 years the tissue will likely be stretched out. You can have a lift at the same time as explant to improve breast shape. You can also consider differently sized implants if you are still interested in more volume. The first step is to visit with a board certified plastic surgeon near you for a consultation.

I can't really tell in the photo, but with such old implants this might represent scar tissue and the old implants probably warrant exchange.