AARP, an American organization for people over age 50, commissioned Ginny Redish and me to give them a scorecard of how well the Web was supporting older people in terms of design. We weren’t to evaluated sites only directed at older adults, but do conduct a broad review of sites that regular people might encounter on any given day, regardless of age.
Ginny and I came up with an unusual method to do this review: persona-based, task-driven heuristic evaluation. Very simply, we tried to take on the personalities of one of two personas, Matthew and Edith, as we did tasks they would do on sites they would normally visit. And then we rated those interactions against a set of heuristics for good design for older people.
See the results. Though this report was published several years ago (2005), the findings are pretty solid.