query: SELECT ?s ?desc (COUNT(DISTINCT ?sitelink) as ?linkcount) WHERE {
    ?s wdt:P31 wd:Q5 .
    ?s wdt:P21 wd:Q6581072 .
    ?s wdt:P569 ?born .
    FILTER (?born > "1920-01-01T00:00:00Z"^^xsd:dateTime) .
    ?sitelink schema:about ?s .
    OPTIONAL {
      ?s wdt:P18 ?dummy
    }
    FILTER ( !bound(?dummy) ) .
    OPTIONAL {
       ?s rdfs:label ?desc filter (lang(?desc) = "en").
     }
   } GROUP BY ?s ?desc ORDER BY DESC(?linkcount) LIMIT 50