Dr. Williams has provided an outstanding concise answer regarding capsular contracture.
Now in answer to your specific question, it is NOT the implant. It sounds as if you have a Baker Grade 2-3 capsular contracture. Implants generally do not get harder or do not dramatically change shape with age (they may yellow and older implants may bleed). It is your body's reaction to the implant that is making them feel different. Whether you pursue surgical correction is up to you.
In the meantime, if you have had silicone implants for 10 years, you should undergo an MRI to evaluate implant integrity or lack of such.
I would encourage you to perform breast implant excercises to prevent or minimize ongoing contracture.
Some surgeons have advise the off-label use of Accolate therapy but this has generally been of benefit in early capsular contracture (less than 6 months old).
The surgical options have been described. However, if there is no progression of firmness and the implants are intact, I generally do not recommend surgery unless you have a desire to change the implants.
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