Have you ever worked for someone and they under-utilized you or just didn't seem to know how to work with an assistant? I once worked for a young boss and you could tell he wasn't quite sure what he could give me or what I was capable of doing. I had enough experience that I just started doing some of the things and when he saw I was ready, willing and able to do it, he gladly passed it on to me. For other things I spoke to him about it and asked if it was something I could do. He was very appreciative of the effort.
Another young woman I worked for seemed to be intimidated by me at first because I was the age of her mother, but over time we started to have a great working relationship. I would often tell her to quit apologizing every time she gave me work to do as she was my boss and I was there to assist her.
IAAP has an article on their website about how to work more effectively with an administrative assistant that I suggest would be a good start for a conversation with your boss.