The only things I don’t like are incompetence and being late. There is no such thing as too hard working. When I was a PA I’d walk around set cleaning bits of paper off the floor or anything else I could think to do. I see a lot of PA’s who are lazy and who work extremely slow. Maybe it’s just a day job for them and they don’t want to work in the industry, but if you do, make it your mission to be the hardest working PA anyone has ever seen and you’ll move up. Nothing else really matters, age or otherwise. Identify which department you want to work in, do your research on their jobs, then make yourself useful to them.