Not to scare you even more, but I read somewhere that people 30yo+ may actually be more susceptible that first thought. May not even have been a credible source though..
As far as estimated mortality rates (I think mostly from data from China & Italy) I remember seeing ~10% for 70yo+, with a sharp drop off after that ~3% for 60-69, and then dropping about 0.75 % points for every decade younger. So the data definitely suggests <60yo is low risk. Sorry I haven't bothered to find my sources for this, but even the "official" #'s are just wild estimates anyways.