title: Mean age and life expectancy at birth in stationary populations: comment.
authors.affiliation: Population Studies Center, University of Pennsylvania, Philadelphia.
authors.forename: S H
authors.initials: SH
authors.lastname: Preston
mesh_terms: D000367:Age Factors; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008017:Life Expectancy; D008433:Mathematics