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Mental decline, could in theory be related to certain non-conditional things like possible low or owered consumption of Healthy Fats, lack of exercise, excessive drinking etc etc, (as opposed to Strokes, Alzheimers etc etc), as stated there, but I think stimulating Mental activities, doesn't necessarily need to be done from specific mind based games as stated above.

There could be a logical train of thought, to suggest other such things like for example Sudoku, Chess, or even a sport like Darts, where someone has to keep a sharp maths Brain, in order to workout all the different combinations of trebles singles and doubles, you can throw to win a leg, set, or game, from say a possible 3 dart finish.

Hay even some Darts players, suggest Darts could be a good aid to numerical learning in schools.

My great-grandfather lived to be nearly 103, he didn't get Alzheimer's until he was 101. His theory was always keep your mind active and your body will follow. I agree that they don't have to be brain games, but anything that keeps you thinking would probably show similar effects.