I am the oldest. I have one brother and he is 2 and 1/2 years younger than me. But he acts older and is more bitter to the world than I am.
I'm more child like now as an adult than I was as a kid and He has never really been in a kid.
Growing up, we hated each other. Now, both of us in our 40s, we are more supportive of one another even though we don't get to see each other much.