I am 28 and this december will be two years since I got my implants. I absolutley love them! Would I have gotten them at 18? No, but if you have the support of your family and friends go for it! Just get lots of research on the doctor you choose. There are so many horror stories out there, but most are due to doctor error.
The one thing I stress to everyone who asks me about mine is be prepared for pain! Lol! My mom and I both took a week off work and I needed her more than I thought I would. I couldn't even go to the bathroom by myself! After a full week I was better, still sore but able to function.
Best of luck to you!