Does Ginkgo Biloba improve memory function? Does Ginkgo Biloba prevent dementia in those over the age of 75?

Does Ginkgo Biloba improve memory function?

A literature review style essay addressing the broad question: Does Ginkgo Biloba improve memory function? Should be narrowed down to a specific age group and type of memeory function. For example: Does Ginkgo Biloba prevent dementia in those over the age of 75?
2200-2500 words – cannot exceed upper limit.