Ahfu also has a heart murmur. Both Ahfu and Storm are roughly the same age; Ahfu is only a little younger, but both are around 9. When I was growing up, I was led to believe that cats had a long lifespan. My family's cat Daisy lived to be 16, and Shasta lived to be 21. But my record isn't as good:
Pookie: 10 - Heart attack
Mikey: 4 - Kidney infection
Oreo: 6 - Total intestine and bowel failure
Artoo: 13 - Kidney failure (mostly old age, though)
I am not sure why cats don't live as long with me. I feed them right, clean the cat box, give them plenty of water... and they never die to to neglect. I just feel unlucky.