I think names from 1960 are still a little too modern. I was born in 1960 and my class was: Sally, Jane, Cheryl, Lynn, Lorna, Susan, Charlotte, FIona, Helen, Jane, Denise, Beverly, Katherine, Gail, Amanda, Kim, Julia, Deborah, Elizabeth, Margaret, Hilary, Heather, Julia, Debbie, Drusilla (multiple Jane's, Helens, Deborah's,).
I think my mother's era will come first: Patricia, Barbara, Marion, Sylvia, Margaret, Daphne, Joan, Jean, Shirley, Gwen, Joy, Joyce, Margot, Marjorie, Phylis, etc. c1936