I'm in my mid 30's, and my hashrate varies depending on whether my wife's PC is participating or not.
My PC gets 290 MH/s on the graphics card and another 16 MH/s on the quad-core CPU.
My wife's PC gets 56 MH/s on the graphics card and 8.5 MH/s on 2 cores of her quad-core CPU.
You're hurting your performance by mining on your CPU and GPU at the same time.
That statement isn't fact, one needs to watch the threads they are using (don't max out all cores if using GPUs) but in my case my GPUs stay in the same place and I add ~28MHash/s by throwing the CPUs into the mix.