You might want to think about genetic testing as you may have one or two APOE4 alleles. If you do, there are some things you can do. In short: exercise, good sleep, limit alcohol, no smoking, good nutrition. Good summary here: https://zenpatient.com/blog/dr-rhonda-patrick-on-the-role-of-the-phospholipid-form-of-dha-in-apoe4-alzheimers/