All of your castings are too old Nicky... you're casting 30 year olds as teenagers, and 60 year olds as 40 year olds.
Dove Cameron and Ella Purnell are both 28 (playing 15 year olds...)
JDM is 58... and heck... John Schnieder is 64
. Great choice if you're thinking Smallville John Schneider - but that was 20 years ago.