Lot's of great guess's. Some were close but a few were way off so hopefully threads like these will help.
If I had asked for a total of all ages combined I think mossback91 would be the closest. Hope you all had fun.
First bear: 23.5 years old

I killed this one in the Quinault gmu and was within a few hundred yards of the Olympic National Park. He lived a long life in the safety of the park. This bear was in great shape with lots of fat but had one upper canine that was broke and looked like an elk whistler.
Second bear: 4.5 years old

This boar had had his butt whooped in the recent past. His face was scared and his chest was raked and he had big canine holes in his hams. A friends friend killed a 300+ lber in the area a week or two before. I also killed a bear the day before this one and he was also 4.5 years old. They were within a mile of each other but one dressed out just under 150# and this one at just under 250#.
Third bear: 11 years old

This was spring 2005 and it came in to a very small and unassuming opening. It had over 3 inches of fat from his butt to his neck and it leads me to believe that most of the fat is not used during the winter but in the spring when there is not enough food. I think that the fat is more important in helping them until the berries ripen.