It's Eleanor Bergstein's life story and she has the right to adapt it no matter how old she is. . In the hands of a 40-something writer--the remake of Dirty Dancing was a stiff.
It won't be the first or last musical not to speak to "today's audience," including Suffs, The Notebook, Like Water For Elephants, and. more than a few recent Tony winters for Best Musical
Your gratuitous swipe at Lonny Price is also ageist.
You actually have no idea if there is a ghost book writer, and it's immaterial to the fact that your comment is ageist.