The old soul is typically more in touch with the subtler natures of reality and doesn't care as much about trivial 3rd dimensional things like power, money, emotion, etc. Its likely many of the people on the more new age spiritual forums are old souls and have reached heights of spiritual ability and knowledge in past lives. They're also the ones more aware that spirituality is the most important part of life and that the rest is only temporary.

A younger soul is still on lessons involving these 3d things and thus thinks of them as important. They're often more preoccupied with money, power, drama, etc. than spiritual or philosophical matters.