My chin implant lost definition, can chin implants shrink over time?

I am a 42 year old female. I had a chin implant (silicone) put in about 14 years ago.Since then I've had two kids and my weight has fluctuated. I was happy with the chin at first but now it looks a lot smaller. My face has obviously changed in that time but not so much (im still slim) that my lower face looks much more rounded now and the implant seems much smaller. Cn they shrink over time?im also concerned about illness from the implant, like breast implant illness. Is this possible?