NOBODY, no matter what age, should be hunting alone. we are all to out of elements to be hunting alone. where i hunt, that is just asking for a death sentance. a broken ankle can do you in alone while out in the wilderness. i don't think that it is a question of age, but a question of common sense. where i hunt, you don't hunt alone, it's a great idea to carrry a sidearm, you don't hunt with a 2 wheel drive pickup, and you always make sure that your four wheeler is in tip top shape before setting out. and take extra gas and maybe another four wheeler. if something breaks down where i hunt, it's about 1.5-2 hours back to camp, and that's just on a four wheeler. and that's just going back to camp, which is a long ways on a truck back to civilization. so where i hunt, if you are hunting alone on foot, you can get lost, be easy prey for a mountain lion, and spend a few nights in the cold.
take a buddy. and a good radio or sattilite phone.