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the short answer is to always be mentally and socially active
mentally activity:
>Mentally challenging activities, such as learning a new skill, adopting a new hobby or engaging in formal education, may have short and long-term benefits for your brain. To keep your mind active, it is important to participate in activities that expose your mind to new topics.
>Challenge yourself to games with strategy or high-level reading material, or determine how to approach a familiar task in a more effective way. Selecting activities you enjoy will increase the likelihood that you will continue to engage in them over time.
also formal education, if you are a senior, you may be able to take university classes for free
socially activity:
>Social engagement is associated with reduced rates of disability and mortality, and may also reduce risk for depression. Remaining socially active may support brain health and possibly delay the onset of dementia. There are many ways to stay socially active in your community, and these activities will provide the greatest connection to others.
>Participation in clubs, volunteer efforts and other community pursuits may be valuable in maintaining your overall health. Many of these social activities are low-cost or free, such as joining a walking group or book club in your neighborhood. Staying socially active can also be as simple as engaging with friends and family on a regular basis.
these are recommedations from an alzheimer's support group btw, but it's still good health advice for everyone
i would add that if you have a spare 15 min each day, do a light walk around the block, cardio helps your head too