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Just as regular physical exercise helps to keep your body in good condition, cognitive exercise helps maintain a healthy brain. There are many ways to keep your brain active.
Playing Treasure Hunter is one way I've done this over the past year. It provides a good break from following crypto-currencies or geopolitics.
The game requires you to gather treasure and avoid traps while negotiating progressively more difficult mazes. Rapid pattern recognition, inductive reasoning, evaluating risk reward ratios and strategic use of resources are some the skills needed.

Pattern Recognition using deductive reasoning:  Simple and moderately complex patterns allow you to determine where the traps are located and label them.  More complex patterns can be used to determine where traps cannot be located.

Using inductive reasoning to evaluate risk reward ratios: There are often situations in this game when you can't be certain of the safe route. Sometimes even landing on a trap can be advantageous if the information gained yields further progress.
Strategic use of resources: The game provides pickaxes, dynamite and maps. Each are useful in certain situations. Early in the game they are cheap and abundant. As you reach higher levels they become progressively more expensive and need to be used judiciously.

There is not yet a widely accepting method for maintaining brain health. I suggest finding one that you enjoy and hopefully it will pay dividends.
The study I've cited below used :
"Ten-session training for memory (verbal episodic memory), reasoning (inductive reasoning), or speed of processing (visual search and identification); 4-session booster training at 11 and 35 months after training in a random sample of those who completed training."
The study concluded:
"Reasoning training resulted in less functional decline in self-reported IADL. Compared with the control group, cognitive training resulted in improved cognitive abilities specific to the abilities trained that continued 5 years after the initiation of the intervention."
IADL = Instrumental activities of daily living

https://www.ncbi.nlm.nih.gov/pubmed?term=17179457

The screenshot above shows my current level in Treasure Hunt. Perhaps I've done too much training.
If you are interested in learning how to play Treasure Hunt, here is a link to a good guide.
http://www.blogordie.com/microsoft-treasure-huntintroduction-and-general-strategies/