title: The reply.
authors.affiliation: Division of Endocrinology, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, Calif.
authors.forename: Preethi
authors.initials: P
authors.lastname: Srikanthan
authors.affiliation: Division of Geriatrics, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, Calif.
authors.forename: Arun S
authors.initials: AS
authors.lastname: Karlamangla
mesh_terms: D001823:Body Composition; D005260:Female; D006801:Humans; D008136:Longevity; D008297:Male; D018482:Muscle, Skeletal / Q000033:anatomy & histology*