Costal fractures are the quickest-healing fractures in the body because of the fact that the fracture cannot be immobilized. It literally has to heal while it's moving, and the movement along the fracture plane provides a great incentive for the bone cells to repair the fracture. A costal chondral fracture is the same type of thing, and it iheals rapidly as well. Even at 40 it will heal very quickly. Follow the instructions from your pain, but train as much as you can stand it without doing any deadlifts for a while. It may be useful to put a knee wrap around your chest during your squats and presses. The injury sticky won't apply here, since the ribcage is involved in every single movement you do and there's no way to pick an exercise. This whole thing should be over in 2-3 weeks, so just be patient.