COGNITIVE AGING An Action Guide for Individuals and Families - From the Institute of Medicine

Have your doctor compare this to his/her protocol on preventing cognitive decline to mine. I know mine should not be listened to because there is no clinical proof that any of it works.
You can compare these to mine.
Dementia prevention 19 ways
http://www.iom.edu/~/media/Files/Report%20Files/2015/Cognitive_aging/Action%20Guide%20for%20Individuals%20and%20Families_V3.pdf 
 The top 3 actions you can take to help
protect your cognitive health as you age

1.  Be physically active.
 Staying physically active can promote
cognitive health in middle-aged and older adults.
2.  Reduce your cardiovascular risk factors (including hypertension,
diabetes, and smoking).  Maintaining cardiovascular health
supports cognitive health.
3.  Manage your medications.
A number of medications can have a
negative effect on cognitive function when used alone or in
combination with other medications. The effects can be temporary
or long-term. It’s important to review all of your medications with a
health care professional and learn about their effects on cognitive
health.
Other actions that may promote cognitive health
• Be socially and intellectually active, and continually seek
opportunities to learn.
• Get adequate sleep and seek professional treatment for sleep
disorders, if needed.
• Talk to your health care provider to learn more about preventing
delirium (a decline in cognitive function that can be associated with
some medications and hospitalization)