I've heard of similar stories about sudoku being good to postpone/avoid dementia. The best explanation I've read is that the most important thing is how much y

I've heard of similar stories about sudoku being good to postpone/avoid dementia. The best explanation I've read is that the most important thing is how much you develop your mental capacity during your lifetime. The higher level you get to and maintain before mental degradation happens, the longer you can go without falling to dementia-related levels. So it's more of a start from a peak, rather than use-it-or-lose-it mechanism. i.e. routinely doing casual puzzles on their own may not make a great difference.