When you’re 90 years old, you are somewhere near the end of your life; got to be... It doesn’t feel like the end yet, but statistically, demographica… - Robert Louis Kahn

We define successful aging as including three main components: low probability of disease and disease-related disability, high cognitive and physical functional capacity, and active engagement with life.

The prescriptions and proscriptions held by members of a role set are designated as role expectations. ... The role expectations held for a certain person by some member of his or her role set will reflect that member's conception of the person's office and his or her abilities. The content of these expectations may include preferences with respect to specific acts and personal characteristics or styles; they may deal with what the person should do, what kind of person he should be, what he should think, or believe, and how he should relate to others.

Overload could be regarded as a kind of inter-sender conflict in which various role senders may hold quite legitimate expectations that a person perform a wide variety of tasks, all of which are mutually compatible in the abstract. But it may be virtually impossible for the focal person to complete all of them within given time limits. He [sic] is likely to experience overload as a conflict of priorities; he must decide which pressures to comply with and which to hold off. If it is impossible to deny any of the pressures, he may be taxed beyond the limits of his abilities. Thus overload involves a kind of person-role conflict and is perhaps best regarded as a complex, emergent type combining aspects of inter-sender and person-role conflicts.