How old are Kylo Ren and Rey?
The actor for Kylo is in his early thirties, so I assumed his character is as well (which would also fit with the age of his parents), but I keep seeing people refer to him as a moody teenager (which may not be referring to age, but rather his manner). As for Rey, I assumed she was late teens/early twenties, but this is only backed up by how she behaves and her personality, not necessarily any facts.
Honestly I just want him to be old enough to support my theory that he
murdered younglings in front of a youngling Rey Skywalker!!!
It's highly unlikely that either of them are over 30; TFA is supposedly set ~30 years after RotJ.
TFA Visual Dictionary says "19-year-old Rey"
There is no canon answer as of right now.
However, Pablo Hidalgo answered Kylo Ren's age on Twitter:
Kylo Ren's BFF @jimwade Dec 19
Hey @pablohidalgo do we have any idea what Kylo's age is in TFA? Around 30?
Pablo Hidalgo @pablohidalgo @jimwade around there. 29-30.
Please be aware that Hidalgo's Twitter account explicitly says "Don't cite tweets as canon" - which Wookieepedia promptly ignored :)