Seniors - Is there a better term for this phase of life?

The term senior citizen is becoming more and more offensive to the aging population, especially to baby boomers who consider themselves lifelong learners.

The "citizen" part, has been dropped in most cases and now we usually see just "seniors"....but even senior sounds older than most in this age group feel.

When does it begin?
When one hits 60 or 65? Or when you get your first invitation to join AARP?
Or later in life when you qualify for the Golden Buckeye card?

If 60 is the new 50 and 70 is the new 60, etc.,that muddies the water even more.

Baby Boomers have the luxury of always falling under the label of "Baby Boomers" - so perhaps "senior" will fade away when all of the Boomers have crossed that "line".

Colleges are calling their classes for seniors "extended learning". Some publications use "Mature" to attract the attention of older adults.

One thing that is clear, as people live longer, the world is searching for a new term to describe this part of life and the age at which older adults "enter it".

Suggestions?