Yeah, age probably has something to do with it as well. I remember one my friends telling me about his younger brother, and how he had to wait a bit for him to mature so they could talk about the same things or hang out together more often. There's only 2 years between me and my brother, so we never had problems like that. This will sound corny as hell, but aside from being family and all that, he's genuinely my absolute best friend.