"I think that is the point. Adaptation is observable - evolution is not."
Comparing the aging of a human body to the evolution of a bacteria in becoming resistant to anti-biotics is a poor example.
Every human body ages. Not every staph bacteria developed resistance to manmade antibiotics. Yet, some did.
Aging is observable. Creationism is not.
Okay, how about people living in hot desert climates have darker skin? How about people (in general) getting taller over generations? Evolution or adaptation?