Love my coffee, and yes, did learn way back that tea is generally better for your health, especially green or white tea. However, coffee is often an "upper" ( in the BA level drugs course, Cornell, 1972) which does get people going, for example, living in homes 24 hours a day! I'd say, in the "old wive's tales" that "it cleans you out" (bm) if your "bowel habits" are not regular.
Beware of Alzheimer's as "early onset" (physicians can test today to see if you are likely to have) because to date, there is no cure (that's what the research group says it will solve for governmental funds) or prevention of the disease (almost everything, better diet and exercise helps in short and long run) which is in "late stages" brain irreversible. Thanks to Charlie Rose for his brain series, and now Cornell University at BA psychology on the brain.
Now, what family often wants to know is who can help in caregiving, especially in mid to late onset? We know that Alzheimer's groups have a special police alert system similar to amber alert set up. And the dementia group originally did have social day care, and mid-onset Alzheimer's may be at social day care in senior centers, replacing other groups previously served (no size changes or quantity change in the senior center systems).
Alzheimer Association provides "family support" from others in the same situation, and professional education and training presentations that families can attend (locally at a hospital). Usually other organizations are responsible for home aides or homecare, or specialized in home services, and nursing care may be in specialized nursing units.
Beware that more of us will have Alzheimers as we live past age 85, not unusual in my life circles, but increasing as the median age increases. Have a super day, and check out the web MD sites, too.