title: Introduction.
authors.affiliation: Instituto Nacional de Geriatría, México, Distrito Federal, México.
authors.forename: Luis Miguel
authors.initials: LM
authors.lastname: Gutiérrez Robledo
authors.affiliation: Center for Demography and Ecology, University of Wisconsin, Madison, Wisconsin, Estados Unidos de América.
authors.forename: Alberto
authors.initials: A
authors.lastname: Palloni
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México.
authors.forename: Martha María
authors.initials: MM
authors.lastname: Téllez Rojo
authors.affiliation: Sealy Center on Aging, WHO/ PAHO Collaborating Center on Aging and Health, University of Texas Medical Branch, Galveston, Texas, Estados Unidos de América.
authors.forename: Rebeca
authors.initials: R
authors.lastname: Wong
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003226:Congresses as Topic; D016208:Databases, Factual; D005260:Female; D005500:Follow-Up Studies; D006306:Health Surveys; D006801:Humans; D008297:Male; D008800:Mexico; D008875:Middle Aged; D011157:Population Dynamics