What a great site---great info!

This my first post so if this question has been asked 1000 times before -- sorry. I'm sure you guys have forgotten more about bows than I'll ever know but I need some beginners help with these questions:

Is there a chart that list the right size bow and pull for the height and arm length of a person? I'm 6'2" w/ a 35 inch sleeve length---what general size bows should I start looking for?

I'm an old 60 year old x-commercial fisherman with bursitis in both shoulders and the 70lb bow I tried at a local gun shop--- I couldn't get it back w/o a lot of hurt---truth is, not use if I could ever get it back again? I then tried a 50 lb and ...Wow...no problem ----is 50LB enough for whitetail hunting in the SE?

Thanks
Sinkbox <><