I'm the guru of gaining permission man. Well, I'm pretty good at it anyways.
The key is to make freinds, but not suck up too much. Go ask the guy if he needs any help doing any chores. Bring the guy a cake or tenderloin, something, every now and then. Then just throw hints every now and then. Like, " I wonder how the hunting is back there" or something like that. You can't just go up to an older cat like that and ask, you have to prove yourself a decent guy with good morals first. I've got permission in the whole valley thru here where I live over the last 7 years, even from the hateful old guys people claimed never to let anyone hunt. If he has a grudge against someone, bring it up. Tell him you never got along with that guy either and you don't blame him for having the grudge. Somwe of them take longer to get thru to than others, but if you want it bad enuf, you can get to their good side. Work is the best way.