I was only able to get my hands on issues 0-9 of this series, and I really liked what I read. Having only a part of the run, though, has left me with some questions. J'onn's origin is retold in issue 0, and it establishes that the John Jones identity was the first one that he subsumed. However, I've read the synopses for some of the issues that came after 9 and saw that one revealed that J'onn was present in Smallville when Clark Kent arrived on Earth. Since I haven't been able to find these issues, my question is: if John Jones was the first identity, and he would have to have been on Earth for at least somewhere around 30 years (given Clark's age), do they explain why the population of Denver has never noticed that John Jones doesn't age?
(sorry if this is scatter-brained, running on 2 hrs. of sleep)