The eight is Saturn, the sign of maturity. It is as solid as Uranus, but with one important difference: Saturn can be talked round if the argument really does carry weight. It holds not to a position but to what it considers true, and it is prepared to revise the latter.
Alongside this there is often an interest in spiritual and contemplative practice — not as a hobby, but as a way of understanding what is happening. Hence the sense that the person is older than their years: they see a situation whole before they take it apart.
Career, for Saturn, is not about money but about self-sufficiency. It builds a position in which it depends on no one, and having reached that, it rarely chases anything further.