impressive. how old is he?

He's fifteen (born Nov. 2, 1991).

I don't quite agree, i think Kristian's interpretation sounds much more unnatural than Blezach's, mainly with his use of rubato in the main theme. Though he is only young, perhaps he will gain a more natural and flowing rubato. A great technique though, but personally, Blechacz's is better his rubato seems to 'flow' more. In fact Blechacz's is my favourite on Youtube. Kristian's performance of the "waterfall" etude is quite amazing too, i'd never seen a video of it till i watched him and it is such an impressive piece.