I believe (though I have no proof) that crosswords are good for the aging mind. They force me to think laterally and to pay attention to word forms and nuances that don't occur naturally in conversation. The NYT crossword increases in difficulty through the week, from easy on Monday to thorny on Thursday (always a gimmick) to really quite a challenge on Saturday. Before Thanksgiving, I could usually power through the Saturday puzzle in 10 to 15 minutes, depending on how many clues depend on knowledge of American university sport.
I do them on my iPad, which I admit is close to cheating. I allow myself to look up certain factoids on Wikipedia: e.g., the names of rappers and hip-hop artists, and American sport arcana, such as the abbreviations of NCAA conferences.
Today I have already moved Edmund's computer and office furniture -- except a Billy bookcase that I have yet to unload -- out of his study and moved mine in. I am now pattering away on my Mac keyboard in what was originally a child's bedroom at the top of the stairs. At little more than eight feet by ten, it's just the right size for a home office, and -- unlike the study (originally the master bedroom) -- it is not cold in winter, so my hands don't turn gunmetal grey and seize up.