Lets see, the bigger ones waddle a bit when walking, their ears are further apart more on the side of the head instead of the top, they should have more of a round head as well, and if i remember right their front shoulders are close to the same height as the back ones where as the young ones have short front shoulders. a big one will look stocky of course where as a young one is pretty lanky, i dont know about baiting but normally a big bear will eat and such where the food is more plentiful where as the younger/smaller ones will stay up higher up on the mountains, also i found this when searching for the info on the shoulders
Adult black bears make a variety of sounds. However, the most commonly heard sounds are woofing and jaw-popping. The young ones whimper or bawl. hope some of this helps you and good luck.