For physical health we have a clear playbook. Lift weights three times a week, walk 8000 steps a day, get protein, sleep eight hours. It's solved. Anyone who follows it gets stronger. For mental health we have a decent playbook too. Therapy, meditation, journaling, time outdoors. Different things work for different people but the playbook exists. For cognitive health - the actual ability to think clearly, hold complex ideas, reason carefully as I cannot find a playbook anywhere. We have all the evidence that it's declining. We have none of the routine that fixes it. Things I've tried that didn't really work: Brain training apps (Lumosity, Peak). These train reaction time and memory. Doesn't transfer to actual reasoning. Reading more. Helps but it's passive. You absorb other people's thinking instead of doing your own. Journaling. Better than nothing. But without prompts I just rehearse the same thoughts. Meditation. Calms the mind. Doesn't strengthen the thinking part.…