private float calcAgeMultiple() {
    if (metabolism == ARTILECT_METABOLISM) return 1 ;
    final float stage = agingStage() ;
    if (actor.species() != null) {  //Make this more precise.  Use Traits.
      return 0.5f + (stage * 0.25f) ;
    }
    if (stage == 0) return 0.70f ;
    if (stage == 1) return 1.00f ;
    if (stage == 2) return 0.85f ;
    if (stage == 3) return 0.65f ;
    return -1 ;
  }