It's just a logical guess that they are very very wise to put someone from the old series in it, and if you had to choose, it would be a very difficult decision.
“Everything seems fine until you're about 40. Then something is definitely beginning to go wrong. And you look in the mirror with your old habit of thinking, 'While I accept that everyone grows old and dies, it's a funny thing, but I'm an exception to that rule.'”