I've done some extremely light research on birth order and my favorite thing to read was that among protestors and people fighting for change or equality tend to be younger/youngest siblings. Thought that was cool.
I'm the older sibling and a lot more motivated in general than my younger brother. I've always been on top of school work and just my life in general and he procrastinates a lot more. He's definitely a little more rebellious and sociable than I am. He's willing to push limits and see what he can get away with.
Cause he knows I will smash his ass