1. Ageing and photoageing of the skin;Gilchrest;Br J Dermatol,1992
2. The mature adult;Cestari,2001
3. Skin and aging processes;Gilchrest,1984
4. The concept of successful and positive aging;Bowling;Am Pract,1993
5. Administration on Aging. Profiles of older americans: 2000. http://www.aoa.dhhs.gov/aoa/ stats/profile.