Human Kinetics: Senior athletes prove age doesn't have to be an obstacle
http://www.humankinetics.com/excerpts/excerpts/senior-athletes-prove-age-doesnt-have-to-be-an-obstacle-
I am an Older Adult or Caregiver
http://www.ncoa.org/get-involved/i-am-older-adult-caregiver.html
8 Areas of Physical Age-Related Change
http://www.nim.nih.gov/medlineplus/magazine/issues/winter07/articles/winter07pg10-13.html