Home > Medical > Dementia > News Updated 21 June 2019 FEATURE DOCUMENTARY: The truth about dementia A personal exploration of one of the most common forms of dementia, the devastating Alzheimer's disease. 0 One of the most common forms of dementia, Alzheimer's disease is marked by a progressive degeneration of brain tissue and primarily affects people over the age of 65. Watch this personal exploration of the devastating condition.Image credit: iStock Related articles WATCH: What happens to the brain during Alzheimer's? Alzheimer's is one of the most common forms of dementia – but is also very much misunderstood. So, what happens to the brain during Alzheimer's? WATCH: New study detects Alzheimer's up to 30 years before symptoms appear What if you could determine if you'll develop Alzheimer's, years in advance? How doing Sudoku and crossword puzzles could make your brain years younger New research supports previous findings that regular use of word and number puzzles helps keep our brains working better for longer.