Just depends on how much real activity those lungs and bad ticker can withstand since generally there is some elevation involved even if you don't go up in the higher mountain elevations. Where we hunt in Wyoming there are plenty of elk down at the 4500' elevation level, but that may be even too high if you have those kinds of health problems. If you have the money, your best bet would be a landowner transferrable tag that could be used on private property that would allow some use of ATVs, quads, etc. to get you around and minimize walking. The best states for those are CO, NM, and UT.