First off, just because of the age doesn't mean it isn't a good camera. I've had my camera since 2007 and it is still going strong, giving me great photos too. (when I work for them... lol)... You might consider just getting a new lens. Are you using the original kit lens? Kit lenses are okay, but only that...
What you can do is take your camera to a camera shop and ask to test out some of the lenses on your camera. Take your lens and set it to a given focal length, say 55mm. Take a picture of something. Switch to a test lens and set to 55mm. Take another picture of the same thing... Say goodbye for the day or see if they will let you view your pictures side by side in the store on a computer... If you tested a good quality lens then you should see a difference right off the bat. Better lenses actually let the camera focus more sharply and background blur from aperture may look different... Better lenses can even improve color reproduction...
Keep in mind that getting a good quality lens can be about as much as a new entry level dSLR, and some are even more expensive. The trade off is that you will have a better lens that will work with your next higher quality camera body.
To put it simply, if you are using the kit lens then you are holding your camera back from it's full potential.
Also, in general the better lenses will be have a max aperture of at least F/2.8 (The smaller the number, the faster and "better" the lens)
Give it some thought and don't let anyone talk you into buying a whole new body unless it is what you want. You may just need a better lens...
Good luck. :)