query: #defaultView:Timeline
  SELECT distinct ?birthdate ?thumbnail ?author ?authorLabel  WHERE {
      ?author wdt:P106 wd:Q484188 ; 
              wdt:P570 ?birthdate 
    OPTIONAL { ?author wdt:P18 ?thumbnail . }
   SERVICE wikibase:label { bd:serviceParam wikibase:language "en, fr, de" }
  }
  ORDER BY ?birthdate