This is not a life decision to take lightly but not because of your age. Prereqs and the nursing program itself can be quite challenging mentally and physically, sure, but if you are in good shape and know how to manage stress, you should be fine. I also wouldn’t be too concerned about being able to stomach a lot. You will be exposed to a lot during nursing school and may get queasy (several of my classmates have passed out watching various procedures) but there is a place for every type of passionate nurse and many that don’t require contact with too many bodily fluids. Exposure to a lot during nursing school helps you find your next passion which is the area/specialty you want to work in! My class has many students in their 40s working on their RNs. Lots of us are second (or third) career folks. I will be graduating in 2020 at the age of 50 and haven’t had any trouble keeping up in any way.