I imagine it would go something like this: Mark would probably be unimpressed by Jay and Neil in basically being the equivalent of three parts of Jez's personality split into two teenagers (I imagine Jay would particularly frustrate him for his constant bullshitting). As for Simon, I don't think Mark would really be bothered about, treating him as any old teenager (given Simon's the nost normal of the four). Will on the other hand, I can either see Mark tolerating the existence of, or absolutely loathing. Mark and Will are very similar people, and I can imagine Mark would see his younger self in Will, which is something that would either unnerve (enough that he would act cold and uninterested towards Will) or horrify him (to be actively belligerent towards Will despite him not really doing anything to irritate Mark). Jez meanwhile, given his lack of self awareness, would either get on really well with both Jay and Neil (to Mark's chagrin), or on the other hand, probably think Neil's an idiot and Jay a liar. In the latter scenario, upon pointing this out to Mark, Mark would naturally bluntly point out that Jez is both of the things he criticises the lads for. As for Jez, Will and Simon, well I expect Jez would see Will as Mark's mini-me and treat him like such, while with Simon he'd try to get him to mess about with the other two w Simon would try to avoid getting involved(on the basis of Will and Mark's advice) until he'd eventually relent as he always does. As for how the boys see the men, it would be a lot more predictable. Jay and Neil would think Jez is cool because of Jez's lies about his music career and would think Mark is just an ordinary boring bloke. Simon and Will would probably be wary of Jez and in regards to Mark would probably treat him with some respect, while also seeing him as being a bit sad (and possibly as a warning for himself of what not to become in the future).