Q. How can I audit a class?

I am not going ask your age, but according to the HCU catalog:

Persons 65 or older, with proof of age, not in pursuit of a degree, may register for a fixed price when space is available. such students may register for these courseson a pass-fail or may receive an alpha grade. Please contact the Cashier's Office for a currente fee structure.

That is the only mention of auditing that we can find. As far as we know, you cannot strictly audit a class (no grade given at all). You would have to contact the Registrar's office for further clarication and details. Their contact information is on the link below.