Previous aging studies show that conversational language causes brain firing and production of new brain cells, resulting in the promotion of social engagement and deterrents to social isolation among aging experts. Therefore, I do not concur with programs that promote solitary endeavors such as crossword puzzles, sudoku, and jigsaw puzzles. Instead, I recommend a threefold approach, lifelong learning and aerobic exercise combined with maintaining close social contacts for promotion of healthy aging.
Park, A. (April 5, 2018). The real reason we aren't as sharp as we age. Time Health, (Summer 2018 print edition.) http://time.com/5228142/brain-nerve-cells-age/