As for the age thing, I would make sure the interviewers know your actual age by working it into the conversation in some way -- or by having it clearly visible on your resume and portfolio. Sometimes you can work that kind of information into a discussion of strengths/weaknesses or career goals and previous experiences ("Since my graduation from nursing school
8 years ago ...") Of course, I know you will dress appropriately, and not too youthful.
I think the 1-page abstract of your research would be VERY appropriate. "I thought you might like to see this ..." since the topic is so relevant to the position. In fact, that might be the one thing that you leave with each interviewer. If that is the case, it can be on a simple sheet of paper with no cover or anything. I would think that if you are only going to leave 1 or 2 things with each interviewer, they could be plain. I would only leave those few things that are most relevant.
If you have a few other things you would like to show -- but not necessarily leave with each interviewer -- you might gather them in a plain folder or binder, and leave one copy with the primary interviewer. This is where you have to be careful. Leaving 2 or 3 small things is OK, leaving a bunch is probably not (because it will make you look wierd -- and nobody wants to hire somebody who is wierd.) I would choose only those things that pertain directly to the job for which you are applying. For example, if the position is primarily managerial, they may not care too much about the artistic creativity you used in an educational program. They would be more interested in your program implementation and evaluation skills. Keep the stuff pertinent, pertinent, pertinent and presented as un-ostentatiously as possible.
It's not so much about making a big production of it, but of quietly showing that you have the substance to do the job well.
Those are just the thoughts off the top of my head,