@prefix n9j: <http://data.loterre.fr/ark:/67375/N9J> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix isothes: <http://purl.org/iso25964/skos-thes#> .

n9j:-DJMVJG0D-H
  skos:prefLabel "gerontology"@en ;
  a skos:Concept ;
  skos:narrower n9j:-KVSSB1HJ-J .

n9j: a skos:ConceptScheme .
n9j:-KVSSB1HJ-J
  owl:sameAs <https://concepts.sagepub.com/social-science/concept/graying_of_population> ;
  skos:definition "The 1870 U.S. Census enumerated the elderly—people 65 years of age or older—at about 1.2 million people (3 percent of the total population of 40 million). However, during the 20th century, with industrialization and changes in fertility and mortality patterns, a new age structure emerged for the population of the United States. [Source: Encyclopedia of Social Problems; Population, Graying of]"@en ;
  a skos:Concept ;
  skos:inScheme n9j: ;
  skos:broader n9j:-DJMVJG0D-H, n9j:-NMZF6HVN-Z ;
  skos:prefLabel "graying of population"@en .

n9j:-NMZF6HVN-Z
  skos:prefLabel "population and environment"@en ;
  a skos:Concept ;
  skos:narrower n9j:-KVSSB1HJ-J .

n9j:-concepts
  a isothes:ConceptGroup ;
  skos:prefLabel "concepts"@en ;
  skos:member n9j:-KVSSB1HJ-J .