When you are very old… – Pierre de Ronsard (1587, French)
https://cbkwgl.wordpress.com/2012/05/04/when-you-are-very-old-pierre-de-ronsard1587-french/
This website contains both the original and the English translation of the sixteenth-century French sonnet on which Yeats based this work. It offers an interesting sense both of how Yeats drew from this earlier work, and of how he has chosen to diverge from it in "When You Are Old."
