SELECT ?resource, ?familyName
WHERE (?resource, <info:age>, ?age) ,
      (?resource, <vCard:N>, ?y) , (?y, <vCard:Family>, ?familyName)
AND ?age >= 24
USING  info  FOR <http://somewhere/peopleInfo#> ,
       vCard FOR <http://www.w3.org/2001/vcard-rdf/3.0#>