The 19 year old needs OD and PA most importantly. I would train his OD to at least strong and his PA to at least respectable. After that, I recommend mixing JS and 1v1 Guards. When you finish with that, I suggest training REB to average or respectable.
The 22 year old needs a little more PA, and more importantly, better inside skills. I think since he is 22, it will be very difficult and slow to train his IS/ID/REB to a level that would make him a basic SF. Plus, his IS is too low. However, you can mold him into an outside SF.