It was in the Q & A that came after chapter 41, along with the characters heights and weights too (not sure if it's been uploaded here, but if you have a Lezhin account it's a free episode). Here are all of the given ages
- Kyon, 25 years old (180cm, 67cm)
- Selvior Lucaon, in his 50's (184cm, 73kg)
- Icarve Sihan, in his 50's (184cm, 71kg)
- Karis, 25 years old (177cm, 66kg)
- Ryan, Age unknown (187cm, 75kg)
- Christoph, 38 years old (168cm, 60kg)
I don't think Christoph was "beaten and tortured", he is being told to do the job thanks to his brother. To what extent he agreed with this probably wont be known until the last raw chapter is properly translated. Christoph was the one who acted violently towards others, and it appears that his brother dotes on him, but whether this is just because he views him as an asset for Intron who knows.
What chapter is this again? I've bought the chapters up to 60 so maybe overlooked this, but from what I recall Edwin values Christoph as he thinks he is the only person available to him who can deceive Cecilia. He gets his Intron staff to wipe the memories that would identify him/them, and replaces them with the "thrown out by his family" lie, his brother at least if physically affectionate towards him, but likely this is motivated by him being an asset towards their mission, Christoph was brainwashed so he would be able to accept orders, but the Intron staff think this might falter as Christoph's "power" is to mighty. Cecilia eventually removes the brainwashing spell, but it appears as though Ryan might get her to remove all memories he has of him, in order to protect him from what happened regarding his (Ryan's) family, and presumably to stop his core from corrupting over the emotional shock, seeing as he loves Ryan.
I bet Ryan won’t leave him after he find out about him >.< poor child he wasn’t sure about he was doing poor things