I had a cat then got a kiten when he was 2. He was really grumpy about it at first, but then you not what kittens are like, he really looked up to him and kept wanting to be with him.
So then as the kitten grew into a cat they've become really good friends.
A few years back I also adopted an older cat that needed a home, but he doesn't get on with him at all-I think as there both set in there ways.
However the younger cat who I had as a kiten gets on fine with new boy.
I think it just depends on the personality of both cats, but if they're both on there own I'm sure they'l bond eventually!