1970s: Although the medical community can recognize and diagnose Alzheimer's disease, treatment options are very limited and do not yet include medications. Patients and families are encouraged to seek support as doctors monitor the disease's progression.

Today: Since 1993, doctors have been able to add medication to their treatment plans for Alzheimer's patients. While the disease is still not reversible, the constantly improving medications make it possible to slow down the mental degeneration.

1970s: The traditional family structure is challenged by increasing divorce rates and acceptance of couples living together. During the 1970s, premarital sex becomes more common, and more women are making the decision not to have children.

Today: Divorce rates remain high (over 50 percent), and the decision to live together is very common among couples who date seriously. Premarital sex is also common and starting at younger ages than ever before. Many women...