Is it common for a saline breast implant to become encapusulated after 30 yrs?

Encapsulation . encapsulation is the natural body response to any implanted foreign body. .
Yes. It is common to have some degree of capsular contracture around an implant after 30 years. A capsule (thin layer of scar tissue) is normal after implantation. If that capsule thickens or tightens it can become hard and painful. Newer techniques of augmentation make capsular contracture less frequent. It is fairly simple to remedy, but does require surgery. Talk with your Plastic Surgeon.