The Watts pre-req's are designed to accommodate the working person. Classes are Tuesdays and Thursdays 6-10 and for the most part homework is at a manageable level.
Starting with the nurse program it becomes more demanding. As a general rule expect to be at school/clinical at a minimum 8-4 Mon-Thu, with some Fridays thrown in and sometimes you need to BE AT clinical before 0700. You also need to allow time for outside classroom requirements such as homework, reading, test prep, skills practice, and group projects, and possibly study groups. Without doubt it's a full-time job of its own.
I'm working full-time during pre-req's, will go to part-time in 1st semester and will become 100% full-time student by 2nd semester (not counting any NA work I do after my Externship between 2nd and 3rd semesters).
As for age...you don't mention your age or have it listed in your profile, so no clue on that.