What's a Hospital Aide and old how do you have to be to apply ?

I'm turning 16 in 27 days and i'm looking for a job. And i came across this (Hospital Aide) And i want to know what's a '' Hospital Aide '' and how old do you have to be to apply?. And please, feel free to put down a list of jobs i can do and website where i can go to, Thank you :)