Here's my interesting response:
My brother and I are about 1 year apart in age. All through our lives people keep telling us that we're like twins, but the ones that does the same hobbies and shit, which is fair enough, since we do hang out together since we were children.
We don't look alike, but the point is that we do the same sorta things, hobbies, etc.
However, our personalities are different. While my brother is younger, he is also selfish and lazy, and I end up doing all the chores. We used to share a bedroom and I end up tidying all the toys, etc.
Around the age of 16-17, we somehow separated, interests and lifestyle wise, he's become rather superficial and shallow, jumping on the popular wagon at everything, listening to trance, dance, anything that seemed cool at the time. Now he's all emo, not emo, but just a sceneboy.
I however, stayed true to my interests and enjoyed my computer games and anime.
But look at us two now, im stay and withdrawn, really nice to talk to but i dont really know how to interact with others, my brother is extremely social and people seem to know him wherever he goes.