All in all, it's very likely that Ben Solo was born a few years at most after the battle Endor (and not when Leia was around 40...), and in his late teens or early twenties he turned against Luke and destroyed his attempt to resurrect the Jedi Order. We don't know for now how much Jedi training he got from Luke, and we know Snoke doesn't consider him fully trained in the dark side either... but it did look like Snoke had better uses for Kylo's time than train him anyway - but with the apparition of Rey he has now reconsidered his priorities...
Okay but remember that the age of the actors really means little, especially in movies. Most of the people in a highschool movie are 25 years old, but we're made to believe they're all 17. Hollywood tends to use older actors because true 18 year olds look very young and can't be taken seriously.
It's been 30 years, so Ren could be up to 30 years old in theory. Even if he is 25, he is a very young dark jedi. I think Darth Maul was at least in his mid 30's. When Leia asks Han to 'bring him home' I got more of an adolescent feeling from Ren. I just can't imagine them saying that about a 30 year old.
I'm not sure how long Ren has been under Snoke's wing, or how long he was under Luke's tutelage. I suspect he was about 10-12 when Leia sent him to Luke and by the time he was 18 he was reasonably trained and also decided to rebel.
If Han and Leia had Ben 5 years after Endor and he is now 20, then Han could have been estranged from Leia for 5 years. I also got a feeling that it's been a while. I was very sorry to see that they were no longer a couple.
Mmm, but this shouldn't make a difference. Force users have abilities that defy their bodies. Yoda was an old man and Sidious was hardly a 'jock' even when he was young. With the Force flowing through them they can perform impossible feats. I find it very unrealistic that anyone could stand against even a reasonably trained dark jedi. Finn was perhaps the most offensive of all, but at least Rey is Force sensitive. I agree that Ren was also significantly injured, but he really didn't need to even dignify Finn with a duel. He could have broken him with the Force alone.
I also, like you, think that Ren hasn't had much guidance regarding the dark side. It's possible that he was too young to have learned from Luke how to construct a Lighsaber - it always seems like the ultimate test, and his red blade does seem primitive. I like theories that I have read that Snoke is a Sith Holocron that Ren found (perhaps on Korriban) in his search to be trained in the dark side.
Once again, this isn't really good enough for me. Finn was trained in combat but we don't know if he was only exposed to a blaster or if he has training in multiple weapons. We know that his desertion followed his very first battle. He also worked in sanitation, so his track record to match a dark Jedi isn't all that great. Even Luke managed to injure Vader in Empire with very basic training. It's possible.
As I've said in other posts Rey is probably a Force prodigy made to balance the Force again. I think the galaxy is heavily unbalanced towards the dark side and the Force never allows that. She's probably more powerful than is normal in such a young Force adept. It's also possible she's Luke's daughter or Ren's sister, in which case she is naturally powerful. Apart from that she is very skilled in many ways. People forget how often she solved problems in the movie.
Fan of Lanfear