"Elders Share the Arts (ESTA) affirms the creative potential of older adults and upholds their time-honored role as bearers of history and culture by using the power of the arts to transmit their stories and life experiences for the benefit of all generations."

http://www.estanyc.org

I discovered this US based organisation while reading an article co-written by the founder Susan Perstein.

Creative Aging: A New Field for the 21st Century
Article: http://dx.doi.org/10.1207/S1541180XTAJ0103_04

ESTA have developed a number of long-standing programmes for older adults including the nicely-titled "Living History Arts", Life Collages and Pearls of Wisdom

ESTA was also part of the reearch by Dr. Gene Cohen on "Creativity and Aging".
PDF of final report - http://arts.endow.gov/resources/Accessibility/CnA-Rep4-30-06.pdf

Introduction video to ESTA and ReServe:
http://vimeo.com/27629704

ReServe is an organisation that fits older people and not-for-profit organisations that might need their years of expertise.

"ReServe is an innovative nonprofit that matches continuing professionals age 55+ (ReServists) with organizations that need their expertise. Nonprofits and public agencies (Partners) can tap into a lifetime of experience to fill crucial staffing gaps at affordable rates."

http://www.reserveinc.org/