I tried the keywords: (elderly OR older people) AND (aging OR aging process) in Academic Search Complete and Health Source: Nursing/Academic Edition, and retrieved some good results. You could also try pairing (physical changes OR physiological changes) with (elderly OR older people). I would visit the library's libguide on gerontology:
http://libguides.unomaha.edu/gerontology
It lists the best databases to use, and also lists print sources here in the library that you may find helpful. Again, I think Academic Search Complete and Health Source: Nursing/Academic Edition will be your best bets. On the search pages for these databases, you can check the "scholarly articles" box to ensure all your results are from peer-reviewed journals. If you need further assistance please contact Eleanor Johnson, the library's gerontology librarian. Her phone number is 402-554-3207, and email is eleanorjohnson@unomaha.edu. Have a great night!
