I don't think most of the old names mentioned here are dated at all. I would say 50's, 60's and 70's names sound dated ie. Susan, Julie, Linda, Kevin, Paul etc Also those I went to school with such as Karen, Kerry, Claire and Louise would sound retro or dated for a baby, to me anyway!
I know a girl under 5 called Sandra and a boy called Jim. I've recently met a baby called Joan.
I love all the early 1900's names. I know Mabel, Florence, Arthur, Stanley, Monty, Ada, Iris, Edie, Reggie, Ronnie, Lottie, Elsie, Ruby, Seth.