I agree Marin Mazzie is a spectacular actress, great voice, can't wait to get my hands on her new album...BUT, she is not appropriate for the role of Dot, her age is indeed an issue for this role, just like other great performers like Donna Murphy. Bernadette Peters was 35, I believe, when she originated this role. Also, "Annie Get Your Gun" is a role that if played by the actress the right age (about 17 or so I believe, correct me if I'm wrong), it could not be as good as it is, because in my opinion it takes a very skilled actress to carry this star-turn; the fact that it was originated by Ethel Merman also allows other productions the chance to cast an older woman in this role.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"