I would say South Dakota would be a good bet. If you can get the tags. Since being stationed there I've tagged several mulies and antelope. Wyoming probably has more antelope, but I think SD probably has more public land. I've always hunted around Butte county and a little town called Newell (sheep capital of the nation!). Plenty of places to get a motel room out there too. And not too far from Sturgis if you get hungry. It's a little more flat out there than Wyoming so there shouldn't be any problem for older hunters.