We've had Smokey for nearly 10 years now, ever since he was born. He was from a litter or 6, and grew up with three other cats. In 2005, we lost my cat Lollipop, in 2006 we lost our youngest cat Panda, and then in 2007 Smokey's older sister Dusty passed away. So since the spring of '07 he has been an only cat.
Having spent the first 6 years of his life with other cats, I wonder about adding another cat to our family. Although Smokey seems quite happy to be an only cat, he also has put on some weight since no longer having his companions.
So after over 3 years on his own, I don't know if bringing another cat into the house is a bad idea. My hopes would be that some of his personality would rub off on the new cat, and he'd never be lonely. My fears are he could become upset by the new cat.