I voted 45# based on your age and health but that being said and you starting out, you need to try several poundages and bow styles. For sure, choose lighter than heavier. Where you are not thinking of hunting yet, lighter may be better. The proof will be in how it feels to shoot. If you are straining to hold, you will develop poor habits and most likely shoot lousy. It is much better to go lighter, develop good form and enjoy the success that comes from shooting accurately. Try several poundages and settle on the one you feel comfortable with. You can always go heavier and having a light bow around is nice to grab and work on/check or perfect your form occasionally. Best of luck.