It's not all good news - although the percentage of instances per age group have been decreasing, as the article says "the overall number of dementia cases is on the rise, due to the increase in life expectancy and the fact there are a greater number of old people".
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That depends on what the information is needed for, I would say. If you need to care for these people, the total number might be more important. If you are getting old yourself and are wondering whether you might get it, then the incidence might be more interesting.