Dependents education

Hi all ,

New to this forum so hello to all !

My question is related to my dependents who are 17 and 15 now …that is their any change in status after they turn 18 ? Do they need to apply for a different visa Or they can continue to be in UK on their 5 year visa .

Also Will they be treated at par with residents during the college admission or …will be treated as foreign national after turning 18?

Thanks for your reply