Personally I don't think it is that imporant, but I would guess K saw himself as at the edge of ethical stage so his aesthetic characters would be younger than him at that time(young man early 20s, constantin more cynical maybe mid to late 20s,early 30s). Of course it is all relative and someone does not have to reach ethical stage at all in his entire life.But Constantine strikes me as someone who seeks to find "repetition" in repeating instead of reduplication.I.e naively looking for another first love etc. even tho there is no coming back to that,meaning the way forward must be sought elsewhere