Mark, Carrie and Harrison have yet to be officially announced as being in the film though.
If Luke's the central hero again and its was Kasdan's idea i really cannot judge until i see the film.
There is already a lot of ageism going on even without a single bit of footage yet shot.
And i take the rumors with a grain of salt, Kenobi's granddaughter. Ridiculous sort of thing like some of the early prequel ones.