Originally Posted by
Airlick
Age doesn't matter. It seems like there have been years since he ran off to become a Sith. Since then, he's been living under Snoke's skirt. He has probably been controlled all the time, even without knowing it. Now, Jedi train their students to abandon emotions, and those who manage it would probably seem mature and wise far beyond their years. Sith do the complete opposite. If there's one thing you can expect Snoke not to do with Kylo, it's helping him resolve his issues. A Sith is supposed to find strength in their issues, one way or another. One Sith could have hate towards someone/something drive him all his life, never really dealing with his issues. Another could become a true Sith after growing mentally strong enough to be able to cut all his ties with the past - this was supposed to be the case with Kylo, except he failed, meaning he's still not a true Sith. Snoke even says that himself.
As for his past, he didn't need to have such a terrible life. It's pretty clear that he had a breakdown during his puberty, and he's stuck in that period even after, I don't know, 15 years. In our world, most people crash into real life (or maybe, real life crashes into them) at some point, forcing them to get over their shitty, immature attitude. That's not the case with Kylo Ren, who, in his own mind, owns the world. He knows that, apart of Snoke, noone can do anything to him. I can't imagine being mostly untouchable helping with going through puberty. I mean, look at Justin Bieber or any other mass-produced teen pop-star, they are just like Kylo Ren, except our world does have authorities, SW world does not. The Sith and the Jedi are the top of the jungle, and frankly, there are no Jedi around anymore as far as most people know.
So yeah, in our world a 30-year old acting like a spoiled, angsty kid is really out of place, but we're a part of a society that expects people to grow up pretty fast. Sith surely don't care about people growing up fast, they care about power, and one doesn't need to be mature to be powerful.
I'm making a lot of assumptions, but I really think they are safe to make. With that, Kylo's character makes perfect sense.