Thanks for your inquiry. Late encapsulation can occur. Some of the reason include implant rupture, trauma leading to a hematoma, muscle tears, and a low grade infection. Please seek the consultation of a board certified plastic surgeon in your area.
In my experience, a capsule this many years out is usually associated with a rupture of the implant. As the gel leaks the body responds by creating more scar tissue. You might want to make an appt with your plastic surgeon. A mammogram can usually detect the presence of a rupture.
Yes, although it is less likely as each year goes on it certainly can happen at any point in the lifespan of an implant. If you are concerned, go see a board certified plastic surgeon near you for a formal assessment. best of luck!