I agree. I would plug those starting point / core keywords into Google Keywords Tool and/or SEMRush and see what you get. Somebody well versed with the industry is helpful but so is someone completely unknown to the industry. Sometimes we call certain things in a certain way, but that's now how majority of the people on the web search.
As Phil said, I would not worry about the age. I would find a subject matter expert, I am sure there are tons of people available on SEOMoz who do freelance. Just see if someone is available, do a small test project and take it from there. If that does not work, sites like Odesk.com have plenty of providers, but then tons of them are offshore. So everything has it's pros and cons.
