My T is roughly twice my age. I actually find it easier to connect with people who are much older than me. That sounds a bit pompous, like I'm trying to make myself out to be super mature or something. I think I just feel more inhibited around my own peer group. As for what we specifically connect over, I guess it's little things, like loving our dogs. T has given me a few personal tidbits of information (nothing groundbreaking, just little facts that make her feel more human) that help me feel more connected to her.