J.M Barrie wrote and ending to the play that was only performed once during his lifetime. It was performed at The Duke of York's Theater in London on Feb. 22, 1908. Here is a link to read the original script:
When Wendy Grew Up (copy of original script)
J. M. Barrie Documentary
A Dedication To The Five
When Wendy Grew Up (original script by J.M. Barrie)