They just cocked up the whole Kes concept from the start, she was only meant to live 9 years and was 2 already, so she would have died in the last episode, but she would have died looking like an old woman, so she should have looked twenty in season one, thirty in season two, and forty in season 3, ect, instead she never aged at all, they gave her slightly longer hair, and then when she came back she had the worst old age makeup ever