I kind of hope that split the Valjean part. someone like Boe for the first part of the play, but Colin Wilkerson for the last act - he still can sing. Given the aging of the character during the play I think it would make sense. It will help put folks in the seats. Perhaps limit him to the “Death” scene if necessary.
That’s a great idea. I’ve always been amused that Cosette ages, but Valjean and Javert stay the same through the whole play.