I thinks it must be mahou shoujo pretty sammy, but I'm not really sure if it's the oldest i've seen.
But the oldest anime animated movie I've seen and like is The sea prince and the fire child (Shiriusu no densetsu), and it was released in 1981.
_ A thread on a subject that I know and where I can add something
_ With some pictures to make it welcoming
_ Where there can be interesting conversations and debates without getting out of subject
_ A funny thread